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perf(core): load replay log from run_started - #3191

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Aug 8, 2026
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perf(core): load replay log from run_started#3191
NathanColosimo merged 67 commits into
codex/consume-run-started-preload-cursorfrom
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@NathanColosimoNathanColosimo commented Jul 29, 2026•
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Summary

  • consume run_started as the same plain event-frame stream used by event listing, with no separate creation-result frame or parser state
  • reconstruct the started run by event type instead of array position, including later attribute changes
  • receive the current replay log in the run_started HTTP response and continue from its trailing cursor only when the bounded response reports hasMore
  • keep CBOR only for skipPreload and other event writes
  • preserve the Turbo path: background run_started, request skipPreload, synthesize the run, and begin replay immediately
  • reuse one strict event-frame decoder for listing and run_started, preserving opaque compressed payloads until runtime hydration

Stack

Stacked on #3124.

Validation

  • package build for @workflow/world-vercel and dependencies
  • pnpm --filter @workflow/world-vercel typecheck
  • pnpm --filter @workflow/world-vercel test — 339 passed
  • changed-file Biome formatting and lint checks
  • paired prerequisite compatibility run — all 13 production targets and the multi-region suite passed

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🦋 Changeset detected

Latest commit: 1e8940d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages
NameType
@workflow/world-vercelPatch
@workflow/cliPatch
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workflowPatch
@workflow/world-testingPatch
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🧪 E2E Test Results

✅ All tests passed

E2E Test Summary

Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production295404783432
✅ 💻 Local Development329004543744
✅ 📦 Local Production329004543744
✅ 🐘 Local Postgres329004543744
✅ 🪟 Windows31200312
✅ 📋 Other207204242496
✅ vercel-multi-region270027
Total152350226417499
Details by Category

✅ ▲ Vercel Production

AppPassedFailedSkipped
✅ astro-node128028
✅ astro-quickjs128028
✅ example-node128028
✅ example-quickjs128028
✅ express-node128028
✅ express-quickjs128028
✅ fastify-node128028
✅ fastify-quickjs128028
✅ hono-node128028
✅ hono-quickjs128028
✅ nextjs-turbopack-node15303
✅ nextjs-turbopack-quickjs15303
✅ nextjs-webpack-node15303
✅ nextjs-webpack-quickjs15303
✅ nitro-node128028
✅ nitro-quickjs128028
✅ nuxt-node128028
✅ nuxt-quickjs128028
✅ sveltekit-node14709
✅ sveltekit-quickjs14709
✅ vite-node128028
✅ vite-quickjs128028

✅ 💻 Local Development

AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026

✅ 📦 Local Production

AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026

✅ 🐘 Local Postgres

AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026

✅ 🪟 Windows

AppPassedFailedSkipped
✅ nextjs-turbopack-node15600
✅ nextjs-turbopack-quickjs15600

✅ 📋 Other

AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable-node130026
✅ e2e-local-dev-nest-stable-quickjs130026
✅ e2e-local-dev-tanstack-start-node130026
✅ e2e-local-dev-tanstack-start-quickjs130026
✅ e2e-local-postgres-nest-stable-node130026
✅ e2e-local-postgres-nest-stable-quickjs130026
✅ e2e-local-postgres-tanstack-start-node130026
✅ e2e-local-postgres-tanstack-start-quickjs130026
✅ e2e-local-prod-nest-stable-node130026
✅ e2e-local-prod-nest-stable-quickjs130026
✅ e2e-local-prod-tanstack-start-node130026
✅ e2e-local-prod-tanstack-start-quickjs130026
✅ e2e-vercel-prod-nest-node128028
✅ e2e-vercel-prod-nest-quickjs128028
✅ e2e-vercel-prod-tanstack-start-node128028
✅ e2e-vercel-prod-tanstack-start-quickjs128028

✅ vercel-multi-region

AppPassedFailedSkipped
✅ nextjs-turbopack2700

📋 View full workflow run

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VaguelySerious approved these changes Aug 3, 2026
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LGMT but tests seem very flaky - let's hold until we verify e2e passes consistently

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📊 Workflow Benchmarks

commit 1e8940d · Fri, 07 Aug 2026 23:49:35 GMT · run logs

Backend: vercel · app: nextjs-turbopack

MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep240 (-7.3%)1369 🔴 (+25%) 🔻1405 🔴 (+22%) 🔻1715 🔴 (+10%)30
TTFSstream251 (+39%) 🔻1340 🔴 (+28%) 🔻1386 🔴 (+28%) 🔻1413 🔴 (+18%) 🔻30
TTFShook + stream321 (-11%)1587 🔴 (+22%) 🔻1603 🔴 (+16%) 🔻1662 🔴 (+9.3%)30
STSO1020 steps (inline)98 (-3.0%)152 (-3.8%)177 (-6.3%)310 (-8.6%)1019
WO1020 steps148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)1
SLstream latency92 (+2.2%)138 🔴 (-3.5%)193 🔴 (-11%)428 🔴 (-49%) 💚30
SOstream overhead (text)122 (-9.6%)344 🔴 (+20%) 🔻763 🔴 (+54%) 🔻1249 🔴 (+19%) 🔻30
SOstream overhead (structured)131 (-1.5%)276 🔴 (-45%) 💚659 🔴 (-23%) 💚2334 🔴 (-2.7%)30
📈 STSO distribution vs main (inline / queue-hop histograms)

1020 steps (inline)

Cumulative STSO time: main 155254ms → this run 147328ms (Δ -7926ms, -5%)

 50-100 ms ┃ main 0 this 1 +1
100-150 ms ██████████████████████░┃ main 667 this 734 +67
150-200 ms ███████┃█ main 276 this 230 -46
200-250 ms ┃ main 45 this 33 -12
250-300 ms ┃ main 10 this 9 -1
300-350 ms ┃ main 12 this 4 -8
350-400 ms ┃ main 5 this 6 +1
450-500 ms ┃ main 1 this 1 +0
800-850 ms ┃ main 1 this 1 +0
850-900 ms ┃ main 2 this 0 -2
📜 Previous results (3)

5ac32a8

Fri, 07 Aug 2026 22:36:47 GMT · run logs

vercel / nextjs-turbopack

MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep273 (+5.4%)1481 🔴 (+35%) 🔻1499 🔴 (+30%) 🔻1548 🔴 (-0.6%)30
TTFSstream1327 (+637%) 🔻1409 🔴 (+35%) 🔻1423 🔴 (+32%) 🔻1558 🔴 (+30%) 🔻30
TTFShook + stream483 (+34%) 🔻1708 🔴 (+32%) 🔻1898 🔴 (+38%) 🔻5933 🔴 (+290%) 🔻30
STSO1020 steps (inline)103 (+2.0%)139 (-12%)159 (-16%) 💚255 (-25%) 💚1019
WO1020 steps138535 (-11%)138535 (-11%)138535 (-11%)138535 (-11%)1
SLstream latency104 (+16%) 🔻141 🔴 (-1.4%)337 🔴 (+56%) 🔻992 🔴 (+19%) 🔻30
SOstream overhead (text)139 (+3.0%)200 (-30%) 💚237 (-52%) 💚319 (-70%) 💚30
SOstream overhead (structured)123 (-7.5%)182 (-64%) 💚225 (-74%) 💚260 (-89%) 💚30

731c052

Fri, 07 Aug 2026 18:55:16 GMT · run logs

vercel / nextjs-turbopack

MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep1319 (+24%) 🔻1465 🔴 (+23%) 🔻1545 🔴 (+23%) 🔻1920 🔴 (+8.2%)30
TTFSstream450 (-59%) 💚1445 🔴 (+18%) 🔻1481 🔴 (+17%) 🔻1553 🔴 (+15%)30
TTFShook + stream1423 (+4.5%)1690 🔴 (+14%)1725 🔴 (+13%)1838 🔴 (+11%)30
STSO1020 steps (inline)93 (-25%) 💚137 (-19%) 💚161 (-17%) 💚295 (-15%) 💚1019
WO1020 steps138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚1
SLstream latency97 (-17%) 💚148 🔴 (-12%)161 🔴 (-23%) 💚250 🔴 (-60%) 💚30
SOstream overhead (text)121 (-18%) 💚240 (+10%)300 (+8.3%)344 (-2.3%)30
SOstream overhead (structured)123 (-22%) 💚205 (-17%) 💚286 (-31%) 💚411 (-92%) 💚30

4fcdebf

Thu, 06 Aug 2026 23:18:57 GMT · run logs

vercel / nextjs-turbopack

MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep233 (-75%) 💚1397 🔴 (+14%)1437 🔴 (+8.0%)1825 🔴 (+11%)30
TTFSstream259 (±0%)1419 🔴 (+19%) 🔻1484 🔴 (+22%) 🔻1716 🔴 (+34%) 🔻30
TTFShook + stream363 (-12%)1645 🔴 (+8.0%)1683 🔴 (+6.7%)1748 🔴 (-15%)30
STSO1020 steps (inline)98 (-7.5%)144 (-21%) 💚170 (-20%) 💚333 (-0.9%)1019
WO1020 steps144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚1
SLstream latency95 (-6.9%)133 🔴 (-28%) 💚153 🔴 (-50%) 💚871 🔴 (+54%) 🔻30
SOstream overhead (text)104 (-27%) 💚207 (-21%) 💚248 (-19%) 💚518 (+9.5%)30
SOstream overhead (structured)141 (-13%)296 🔴 (-23%) 💚383 (-26%) 💚865 (-2.1%)30
ℹ️ Metric definitions & methodology

The collapsed STSO distribution section above buckets every step gap of the sequential-steps run (not a sampled window), split by whether the step ending the gap ran inline — in the same warm process as the step before it, so the gap is pure framework overhead — or after a queue-hop — the first step of a fresh process, which pays queue dispatch, client reinit and event-log replay. Bars overlay the two runs: █ is main, ┃ marks where this run lands, ░ bridges the gap when this run has more samples in a bucket.

Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.

Metrics — TTFS: time to first step body (in-deployment start() → first step body, deployment clocks) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · SL: stream latency (in-deployment write → read propagation, readAt - writtenAt) · SO: stream overhead (end-to-end write+consume time beyond the modelled generation window)

Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · stream latency: parallel reader/writer steps on a dedicated stream; SL is the in-deployment write->read propagation (readAt - writtenAt) · stream overhead (text): writer streams 300 variable-length text token deltas paced at 100/s for 3s (a haiku-size LLM's token throughput) while a parallel reader drains the whole stream; SO is the end-to-end write+consume time beyond the 3s generation window (overhead/backpressure) · stream overhead (structured): same workload as stream overhead (text), but each delta is an AI-SDK-style structured object ({ type: 'text-delta', id, text }) instead of a raw string, so the SO gap vs the text scenario is the added serialization cost

🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · SO 250/500/1000

All metrics are measured from deployment-side timestamps only. Runs are triggered by an in-deployment route that stamps the anchor (clientStart) right before start(), so the CI runner’s request and its path through api.vercel.com sit outside every measured window. TTFS = in-deployment start() → first step body (turbo uses the in-process fast path, non-turbo the dispatch path), and includes the VQS dispatch hop plus any /flow cold start. STSO/WO are measured between step bodies on the deployment. SL is measured inside the workflow (parallel reader/writer steps), so it no longer includes the api.vercel.com read path.

Cold starts are kept in the numbers on purpose — they are part of real bursty-workload latency. The workbench deployment cold-starts the /flow invocation for a large fraction of runs, inflating P75+; the Best column shows the fastest (warm-start) sample for comparison.

vercel[bot]
vercelBot reviewed Aug 3, 2026
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Comment threadpackages/world-vercel/src/events.ts
@NathanColosimo
Fix out-of-order run lifecycle replay
9235160
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
0ea6dc3
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e41dcb2
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
6696142
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e05435e
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
565e9b2
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
b8d6800
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
9ea5231
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
fd88bab
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
414e4cd
…ream-run-started-replay-page
# Conflicts:
#	packages/world-vercel/src/events.ts
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
c712106
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
b0db86b
…ream-run-started-replay-page
@NathanColosimo
Merge commit '9eafd6c638b51fc1c905a16872e091fac8f273ea' into codex/st…
9573503
…ream-run-started-replay-page
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perf(core): load replay log from run_started by NathanColosimo · Pull Request #3191 · vercel/workflow · GitHub
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perf(core): load replay log from run_started - #3191
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NathanColosimo merged 67 commits into
codex/consume-run-started-preload-cursorfrom 
codex/stream-run-started-replay-page
Aug 8, 2026
Merged
perf(core): load replay log from run_started#3191
NathanColosimo merged 67 commits into
codex/consume-run-started-preload-cursorfrom 
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Summary
  • consume run_started as the same plain event-frame stream used by event listing, with no separate creation-result frame or parser state
  • reconstruct the started run by event type instead of array position, including later attribute changes
  • receive the current replay log in the run_started HTTP response and continue from its trailing cursor only when the bounded response reports hasMore
  • keep CBOR only for skipPreload and other event writes
  • preserve the Turbo path: background run_started, request skipPreload, synthesize the run, and begin replay immediately
  • reuse one strict event-frame decoder for listing and run_started, preserving opaque compressed payloads until runtime hydration
Stack
Stacked on #3124.
Validation
  • package build for @workflow/world-vercel and dependencies
  • pnpm --filter @workflow/world-vercel typecheck
  • pnpm --filter @workflow/world-vercel test — 339 passed
  • changed-file Biome formatting and lint checks
  • paired prerequisite compatibility run — all 13 production targets and the multi-region suite passed
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🦋 Changeset detected
Latest commit: 1e8940d
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 17 packages
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@workflow/world-vercelPatch
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🧪 E2E Test Results
✅ All tests passed
E2E Test Summary
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production295404783432
✅ 💻 Local Development329004543744
✅ 📦 Local Production329004543744
✅ 🐘 Local Postgres329004543744
✅ 🪟 Windows31200312
✅ 📋 Other207204242496
✅ vercel-multi-region270027
Total152350226417499
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node128028
✅ astro-quickjs128028
✅ example-node128028
✅ example-quickjs128028
✅ express-node128028
✅ express-quickjs128028
✅ fastify-node128028
✅ fastify-quickjs128028
✅ hono-node128028
✅ hono-quickjs128028
✅ nextjs-turbopack-node15303
✅ nextjs-turbopack-quickjs15303
✅ nextjs-webpack-node15303
✅ nextjs-webpack-quickjs15303
✅ nitro-node128028
✅ nitro-quickjs128028
✅ nuxt-node128028
✅ nuxt-quickjs128028
✅ sveltekit-node14709
✅ sveltekit-quickjs14709
✅ vite-node128028
✅ vite-quickjs128028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack-node15600
✅ nextjs-turbopack-quickjs15600
✅ 📋 Other
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✅ e2e-local-dev-nest-stable-node130026
✅ e2e-local-dev-nest-stable-quickjs130026
✅ e2e-local-dev-tanstack-start-node130026
✅ e2e-local-dev-tanstack-start-quickjs130026
✅ e2e-local-postgres-nest-stable-node130026
✅ e2e-local-postgres-nest-stable-quickjs130026
✅ e2e-local-postgres-tanstack-start-node130026
✅ e2e-local-postgres-tanstack-start-quickjs130026
✅ e2e-local-prod-nest-stable-node130026
✅ e2e-local-prod-nest-stable-quickjs130026
✅ e2e-local-prod-tanstack-start-node130026
✅ e2e-local-prod-tanstack-start-quickjs130026
✅ e2e-vercel-prod-nest-node128028
✅ e2e-vercel-prod-nest-quickjs128028
✅ e2e-vercel-prod-tanstack-start-node128028
✅ e2e-vercel-prod-tanstack-start-quickjs128028
✅ vercel-multi-region
AppPassedFailedSkipped
✅ nextjs-turbopack2700
📋 View full workflow run
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LGMT but tests seem very flaky - let's hold until we verify e2e passes consistently
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📊 Workflow Benchmarks
commit 1e8940d · Fri, 07 Aug 2026 23:49:35 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep240 (-7.3%)1369 🔴 (+25%) 🔻1405 🔴 (+22%) 🔻1715 🔴 (+10%)30
TTFSstream251 (+39%) 🔻1340 🔴 (+28%) 🔻1386 🔴 (+28%) 🔻1413 🔴 (+18%) 🔻30
TTFShook + stream321 (-11%)1587 🔴 (+22%) 🔻1603 🔴 (+16%) 🔻1662 🔴 (+9.3%)30
STSO1020 steps (inline)98 (-3.0%)152 (-3.8%)177 (-6.3%)310 (-8.6%)1019
WO1020 steps148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)1
SLstream latency92 (+2.2%)138 🔴 (-3.5%)193 🔴 (-11%)428 🔴 (-49%) 💚30
SOstream overhead (text)122 (-9.6%)344 🔴 (+20%) 🔻763 🔴 (+54%) 🔻1249 🔴 (+19%) 🔻30
SOstream overhead (structured)131 (-1.5%)276 🔴 (-45%) 💚659 🔴 (-23%) 💚2334 🔴 (-2.7%)30
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 155254ms → this run 147328ms (Δ -7926ms, -5%)
 50-100 ms ┃ main 0 this 1 +1
100-150 ms ██████████████████████░┃ main 667 this 734 +67
150-200 ms ███████┃█ main 276 this 230 -46
200-250 ms ┃ main 45 this 33 -12
250-300 ms ┃ main 10 this 9 -1
300-350 ms ┃ main 12 this 4 -8
350-400 ms ┃ main 5 this 6 +1
450-500 ms ┃ main 1 this 1 +0
800-850 ms ┃ main 1 this 1 +0
850-900 ms ┃ main 2 this 0 -2

📜 Previous results (3)
5ac32a8
Fri, 07 Aug 2026 22:36:47 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep273 (+5.4%)1481 🔴 (+35%) 🔻1499 🔴 (+30%) 🔻1548 🔴 (-0.6%)30
TTFSstream1327 (+637%) 🔻1409 🔴 (+35%) 🔻1423 🔴 (+32%) 🔻1558 🔴 (+30%) 🔻30
TTFShook + stream483 (+34%) 🔻1708 🔴 (+32%) 🔻1898 🔴 (+38%) 🔻5933 🔴 (+290%) 🔻30
STSO1020 steps (inline)103 (+2.0%)139 (-12%)159 (-16%) 💚255 (-25%) 💚1019
WO1020 steps138535 (-11%)138535 (-11%)138535 (-11%)138535 (-11%)1
SLstream latency104 (+16%) 🔻141 🔴 (-1.4%)337 🔴 (+56%) 🔻992 🔴 (+19%) 🔻30
SOstream overhead (text)139 (+3.0%)200 (-30%) 💚237 (-52%) 💚319 (-70%) 💚30
SOstream overhead (structured)123 (-7.5%)182 (-64%) 💚225 (-74%) 💚260 (-89%) 💚30
731c052
Fri, 07 Aug 2026 18:55:16 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep1319 (+24%) 🔻1465 🔴 (+23%) 🔻1545 🔴 (+23%) 🔻1920 🔴 (+8.2%)30
TTFSstream450 (-59%) 💚1445 🔴 (+18%) 🔻1481 🔴 (+17%) 🔻1553 🔴 (+15%)30
TTFShook + stream1423 (+4.5%)1690 🔴 (+14%)1725 🔴 (+13%)1838 🔴 (+11%)30
STSO1020 steps (inline)93 (-25%) 💚137 (-19%) 💚161 (-17%) 💚295 (-15%) 💚1019
WO1020 steps138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚1
SLstream latency97 (-17%) 💚148 🔴 (-12%)161 🔴 (-23%) 💚250 🔴 (-60%) 💚30
SOstream overhead (text)121 (-18%) 💚240 (+10%)300 (+8.3%)344 (-2.3%)30
SOstream overhead (structured)123 (-22%) 💚205 (-17%) 💚286 (-31%) 💚411 (-92%) 💚30
4fcdebf
Thu, 06 Aug 2026 23:18:57 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep233 (-75%) 💚1397 🔴 (+14%)1437 🔴 (+8.0%)1825 🔴 (+11%)30
TTFSstream259 (±0%)1419 🔴 (+19%) 🔻1484 🔴 (+22%) 🔻1716 🔴 (+34%) 🔻30
TTFShook + stream363 (-12%)1645 🔴 (+8.0%)1683 🔴 (+6.7%)1748 🔴 (-15%)30
STSO1020 steps (inline)98 (-7.5%)144 (-21%) 💚170 (-20%) 💚333 (-0.9%)1019
WO1020 steps144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚1
SLstream latency95 (-6.9%)133 🔴 (-28%) 💚153 🔴 (-50%) 💚871 🔴 (+54%) 🔻30
SOstream overhead (text)104 (-27%) 💚207 (-21%) 💚248 (-19%) 💚518 (+9.5%)30
SOstream overhead (structured)141 (-13%)296 🔴 (-23%) 💚383 (-26%) 💚865 (-2.1%)30
ℹ️ Metric definitions & methodology
The collapsed STSO distribution section above buckets every step gap of the sequential-steps run (not a sampled window), split by whether the step ending the gap ran inline — in the same warm process as the step before it, so the gap is pure framework overhead — or after a queue-hop — the first step of a fresh process, which pays queue dispatch, client reinit and event-log replay. Bars overlay the two runs: █ is main, ┃ marks where this run lands, ░ bridges the gap when this run has more samples in a bucket.
Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.
Metrics — TTFS: time to first step body (in-deployment start() → first step body, deployment clocks) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · SL: stream latency (in-deployment write → read propagation, readAt - writtenAt) · SO: stream overhead (end-to-end write+consume time beyond the modelled generation window)
Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · stream latency: parallel reader/writer steps on a dedicated stream; SL is the in-deployment write->read propagation (readAt - writtenAt) · stream overhead (text): writer streams 300 variable-length text token deltas paced at 100/s for 3s (a haiku-size LLM's token throughput) while a parallel reader drains the whole stream; SO is the end-to-end write+consume time beyond the 3s generation window (overhead/backpressure) · stream overhead (structured): same workload as stream overhead (text), but each delta is an AI-SDK-style structured object ({ type: 'text-delta', id, text }) instead of a raw string, so the SO gap vs the text scenario is the added serialization cost
🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · SO 250/500/1000
All metrics are measured from deployment-side timestamps only. Runs are triggered by an in-deployment route that stamps the anchor (clientStart) right before start(), so the CI runner’s request and its path through api.vercel.com sit outside every measured window. TTFS = in-deployment start() → first step body (turbo uses the in-process fast path, non-turbo the dispatch path), and includes the VQS dispatch hop plus any /flow cold start. STSO/WO are measured between step bodies on the deployment. SL is measured inside the workflow (parallel reader/writer steps), so it no longer includes the api.vercel.com read path.
Cold starts are kept in the numbers on purpose — they are part of real bursty-workload latency. The workbench deployment cold-starts the /flow invocation for a large fraction of runs, inflating P75+; the Best column shows the fastest (warm-start) sample for comparison.
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Comment threadpackages/world-vercel/src/events.ts
@NathanColosimo
Fix out-of-order run lifecycle replay
9235160
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
0ea6dc3
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e41dcb2
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
6696142
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e05435e
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
565e9b2
…d-cursor' into codex/stream-run-started-replay-page
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
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Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
414e4cd
…ream-run-started-replay-page
# Conflicts:
#	packages/world-vercel/src/events.ts
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
c712106
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
b0db86b
…ream-run-started-replay-page
@NathanColosimo
Merge commit '9eafd6c638b51fc1c905a16872e091fac8f273ea' into codex/st…
9573503
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perf(core): load replay log from run_started by NathanColosimo · Pull Request #3191 · vercel/workflow · GitHub
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perf(core): load replay log from run_started - #3191
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perf(core): load replay log from run_started#3191
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Summary
  • consume run_started as the same plain event-frame stream used by event listing, with no separate creation-result frame or parser state
  • reconstruct the started run by event type instead of array position, including later attribute changes
  • receive the current replay log in the run_started HTTP response and continue from its trailing cursor only when the bounded response reports hasMore
  • keep CBOR only for skipPreload and other event writes
  • preserve the Turbo path: background run_started, request skipPreload, synthesize the run, and begin replay immediately
  • reuse one strict event-frame decoder for listing and run_started, preserving opaque compressed payloads until runtime hydration
Stack
Stacked on #3124.
Validation
  • package build for @workflow/world-vercel and dependencies
  • pnpm --filter @workflow/world-vercel typecheck
  • pnpm --filter @workflow/world-vercel test — 339 passed
  • changed-file Biome formatting and lint checks
  • paired prerequisite compatibility run — all 13 production targets and the multi-region suite passed
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreviewAug 7, 2026 11:35pm
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🦋 Changeset detected
Latest commit: 1e8940d
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 17 packages
NameType
@workflow/world-vercelPatch
@workflow/cliPatch
@workflow/corePatch
@workflow/webPatch
workflowPatch
@workflow/world-testingPatch
@workflow/buildersPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
@workflow/nuxtPatch
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🧪 E2E Test Results
✅ All tests passed
E2E Test Summary
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production295404783432
✅ 💻 Local Development329004543744
✅ 📦 Local Production329004543744
✅ 🐘 Local Postgres329004543744
✅ 🪟 Windows31200312
✅ 📋 Other207204242496
✅ vercel-multi-region270027
Total152350226417499
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node128028
✅ astro-quickjs128028
✅ example-node128028
✅ example-quickjs128028
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LGMT but tests seem very flaky - let's hold until we verify e2e passes consistently
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📊 Workflow Benchmarks
commit 1e8940d · Fri, 07 Aug 2026 23:49:35 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep240 (-7.3%)1369 🔴 (+25%) 🔻1405 🔴 (+22%) 🔻1715 🔴 (+10%)30
TTFSstream251 (+39%) 🔻1340 🔴 (+28%) 🔻1386 🔴 (+28%) 🔻1413 🔴 (+18%) 🔻30
TTFShook + stream321 (-11%)1587 🔴 (+22%) 🔻1603 🔴 (+16%) 🔻1662 🔴 (+9.3%)30
STSO1020 steps (inline)98 (-3.0%)152 (-3.8%)177 (-6.3%)310 (-8.6%)1019
WO1020 steps148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)1
SLstream latency92 (+2.2%)138 🔴 (-3.5%)193 🔴 (-11%)428 🔴 (-49%) 💚30
SOstream overhead (text)122 (-9.6%)344 🔴 (+20%) 🔻763 🔴 (+54%) 🔻1249 🔴 (+19%) 🔻30
SOstream overhead (structured)131 (-1.5%)276 🔴 (-45%) 💚659 🔴 (-23%) 💚2334 🔴 (-2.7%)30
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 155254ms → this run 147328ms (Δ -7926ms, -5%)
 50-100 ms ┃ main 0 this 1 +1
100-150 ms ██████████████████████░┃ main 667 this 734 +67
150-200 ms ███████┃█ main 276 this 230 -46
200-250 ms ┃ main 45 this 33 -12
250-300 ms ┃ main 10 this 9 -1
300-350 ms ┃ main 12 this 4 -8
350-400 ms ┃ main 5 this 6 +1
450-500 ms ┃ main 1 this 1 +0
800-850 ms ┃ main 1 this 1 +0
850-900 ms ┃ main 2 this 0 -2

📜 Previous results (3)
5ac32a8
Fri, 07 Aug 2026 22:36:47 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep273 (+5.4%)1481 🔴 (+35%) 🔻1499 🔴 (+30%) 🔻1548 🔴 (-0.6%)30
TTFSstream1327 (+637%) 🔻1409 🔴 (+35%) 🔻1423 🔴 (+32%) 🔻1558 🔴 (+30%) 🔻30
TTFShook + stream483 (+34%) 🔻1708 🔴 (+32%) 🔻1898 🔴 (+38%) 🔻5933 🔴 (+290%) 🔻30
STSO1020 steps (inline)103 (+2.0%)139 (-12%)159 (-16%) 💚255 (-25%) 💚1019
WO1020 steps138535 (-11%)138535 (-11%)138535 (-11%)138535 (-11%)1
SLstream latency104 (+16%) 🔻141 🔴 (-1.4%)337 🔴 (+56%) 🔻992 🔴 (+19%) 🔻30
SOstream overhead (text)139 (+3.0%)200 (-30%) 💚237 (-52%) 💚319 (-70%) 💚30
SOstream overhead (structured)123 (-7.5%)182 (-64%) 💚225 (-74%) 💚260 (-89%) 💚30
731c052
Fri, 07 Aug 2026 18:55:16 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep1319 (+24%) 🔻1465 🔴 (+23%) 🔻1545 🔴 (+23%) 🔻1920 🔴 (+8.2%)30
TTFSstream450 (-59%) 💚1445 🔴 (+18%) 🔻1481 🔴 (+17%) 🔻1553 🔴 (+15%)30
TTFShook + stream1423 (+4.5%)1690 🔴 (+14%)1725 🔴 (+13%)1838 🔴 (+11%)30
STSO1020 steps (inline)93 (-25%) 💚137 (-19%) 💚161 (-17%) 💚295 (-15%) 💚1019
WO1020 steps138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚1
SLstream latency97 (-17%) 💚148 🔴 (-12%)161 🔴 (-23%) 💚250 🔴 (-60%) 💚30
SOstream overhead (text)121 (-18%) 💚240 (+10%)300 (+8.3%)344 (-2.3%)30
SOstream overhead (structured)123 (-22%) 💚205 (-17%) 💚286 (-31%) 💚411 (-92%) 💚30
4fcdebf
Thu, 06 Aug 2026 23:18:57 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep233 (-75%) 💚1397 🔴 (+14%)1437 🔴 (+8.0%)1825 🔴 (+11%)30
TTFSstream259 (±0%)1419 🔴 (+19%) 🔻1484 🔴 (+22%) 🔻1716 🔴 (+34%) 🔻30
TTFShook + stream363 (-12%)1645 🔴 (+8.0%)1683 🔴 (+6.7%)1748 🔴 (-15%)30
STSO1020 steps (inline)98 (-7.5%)144 (-21%) 💚170 (-20%) 💚333 (-0.9%)1019
WO1020 steps144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚1
SLstream latency95 (-6.9%)133 🔴 (-28%) 💚153 🔴 (-50%) 💚871 🔴 (+54%) 🔻30
SOstream overhead (text)104 (-27%) 💚207 (-21%) 💚248 (-19%) 💚518 (+9.5%)30
SOstream overhead (structured)141 (-13%)296 🔴 (-23%) 💚383 (-26%) 💚865 (-2.1%)30
ℹ️ Metric definitions & methodology
The collapsed STSO distribution section above buckets every step gap of the sequential-steps run (not a sampled window), split by whether the step ending the gap ran inline — in the same warm process as the step before it, so the gap is pure framework overhead — or after a queue-hop — the first step of a fresh process, which pays queue dispatch, client reinit and event-log replay. Bars overlay the two runs: █ is main, ┃ marks where this run lands, ░ bridges the gap when this run has more samples in a bucket.
Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.
Metrics — TTFS: time to first step body (in-deployment start() → first step body, deployment clocks) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · SL: stream latency (in-deployment write → read propagation, readAt - writtenAt) · SO: stream overhead (end-to-end write+consume time beyond the modelled generation window)
Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · stream latency: parallel reader/writer steps on a dedicated stream; SL is the in-deployment write->read propagation (readAt - writtenAt) · stream overhead (text): writer streams 300 variable-length text token deltas paced at 100/s for 3s (a haiku-size LLM's token throughput) while a parallel reader drains the whole stream; SO is the end-to-end write+consume time beyond the 3s generation window (overhead/backpressure) · stream overhead (structured): same workload as stream overhead (text), but each delta is an AI-SDK-style structured object ({ type: 'text-delta', id, text }) instead of a raw string, so the SO gap vs the text scenario is the added serialization cost
🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · SO 250/500/1000
All metrics are measured from deployment-side timestamps only. Runs are triggered by an in-deployment route that stamps the anchor (clientStart) right before start(), so the CI runner’s request and its path through api.vercel.com sit outside every measured window. TTFS = in-deployment start() → first step body (turbo uses the in-process fast path, non-turbo the dispatch path), and includes the VQS dispatch hop plus any /flow cold start. STSO/WO are measured between step bodies on the deployment. SL is measured inside the workflow (parallel reader/writer steps), so it no longer includes the api.vercel.com read path.
Cold starts are kept in the numbers on purpose — they are part of real bursty-workload latency. The workbench deployment cold-starts the /flow invocation for a large fraction of runs, inflating P75+; the Best column shows the fastest (warm-start) sample for comparison.
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Comment threadpackages/world-vercel/src/events.ts
@NathanColosimo
Fix out-of-order run lifecycle replay
9235160
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
0ea6dc3
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e41dcb2
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
414e4cd
…ream-run-started-replay-page
# Conflicts:
#	packages/world-vercel/src/events.ts
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
c712106
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
b0db86b
…ream-run-started-replay-page
@NathanColosimo
Merge commit '9eafd6c638b51fc1c905a16872e091fac8f273ea' into codex/st…
9573503
…ream-run-started-replay-page
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perf(core): load replay log from run_started by NathanColosimo · Pull Request #3191 · vercel/workflow · GitHub
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perf(core): load replay log from run_started - #3191
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perf(core): load replay log from run_started#3191
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Summary
  • consume run_started as the same plain event-frame stream used by event listing, with no separate creation-result frame or parser state
  • reconstruct the started run by event type instead of array position, including later attribute changes
  • receive the current replay log in the run_started HTTP response and continue from its trailing cursor only when the bounded response reports hasMore
  • keep CBOR only for skipPreload and other event writes
  • preserve the Turbo path: background run_started, request skipPreload, synthesize the run, and begin replay immediately
  • reuse one strict event-frame decoder for listing and run_started, preserving opaque compressed payloads until runtime hydration
Stack
Stacked on #3124.
Validation
  • package build for @workflow/world-vercel and dependencies
  • pnpm --filter @workflow/world-vercel typecheck
  • pnpm --filter @workflow/world-vercel test — 339 passed
  • changed-file Biome formatting and lint checks
  • paired prerequisite compatibility run — all 13 production targets and the multi-region suite passed
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreviewAug 7, 2026 11:35pm
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🦋 Changeset detected
Latest commit: 1e8940d
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 17 packages
NameType
@workflow/world-vercelPatch
@workflow/cliPatch
@workflow/corePatch
@workflow/webPatch
workflowPatch
@workflow/world-testingPatch
@workflow/buildersPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/astroPatch
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🧪 E2E Test Results
✅ All tests passed
E2E Test Summary
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production295404783432
✅ 💻 Local Development329004543744
✅ 📦 Local Production329004543744
✅ 🐘 Local Postgres329004543744
✅ 🪟 Windows31200312
✅ 📋 Other207204242496
✅ vercel-multi-region270027
Total152350226417499
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node128028
✅ astro-quickjs128028
✅ example-node128028
✅ example-quickjs128028
✅ express-node128028
✅ express-quickjs128028
✅ fastify-node128028
✅ fastify-quickjs128028
✅ hono-node128028
✅ hono-quickjs128028
✅ nextjs-turbopack-node15303
✅ nextjs-turbopack-quickjs15303
✅ nextjs-webpack-node15303
✅ nextjs-webpack-quickjs15303
✅ nitro-node128028
✅ nitro-quickjs128028
✅ nuxt-node128028
✅ nuxt-quickjs128028
✅ sveltekit-node14709
✅ sveltekit-quickjs14709
✅ vite-node128028
✅ vite-quickjs128028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
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✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
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✅ vite-stable-node130026
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✅ 📦 Local Production
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✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack-node15600
✅ nextjs-turbopack-quickjs15600
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable-node130026
✅ e2e-local-dev-nest-stable-quickjs130026
✅ e2e-local-dev-tanstack-start-node130026
✅ e2e-local-dev-tanstack-start-quickjs130026
✅ e2e-local-postgres-nest-stable-node130026
✅ e2e-local-postgres-nest-stable-quickjs130026
✅ e2e-local-postgres-tanstack-start-node130026
✅ e2e-local-postgres-tanstack-start-quickjs130026
✅ e2e-local-prod-nest-stable-node130026
✅ e2e-local-prod-nest-stable-quickjs130026
✅ e2e-local-prod-tanstack-start-node130026
✅ e2e-local-prod-tanstack-start-quickjs130026
✅ e2e-vercel-prod-nest-node128028
✅ e2e-vercel-prod-nest-quickjs128028
✅ e2e-vercel-prod-tanstack-start-node128028
✅ e2e-vercel-prod-tanstack-start-quickjs128028
✅ vercel-multi-region
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✅ nextjs-turbopack2700
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LGMT but tests seem very flaky - let's hold until we verify e2e passes consistently
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📊 Workflow Benchmarks
commit 1e8940d · Fri, 07 Aug 2026 23:49:35 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep240 (-7.3%)1369 🔴 (+25%) 🔻1405 🔴 (+22%) 🔻1715 🔴 (+10%)30
TTFSstream251 (+39%) 🔻1340 🔴 (+28%) 🔻1386 🔴 (+28%) 🔻1413 🔴 (+18%) 🔻30
TTFShook + stream321 (-11%)1587 🔴 (+22%) 🔻1603 🔴 (+16%) 🔻1662 🔴 (+9.3%)30
STSO1020 steps (inline)98 (-3.0%)152 (-3.8%)177 (-6.3%)310 (-8.6%)1019
WO1020 steps148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)1
SLstream latency92 (+2.2%)138 🔴 (-3.5%)193 🔴 (-11%)428 🔴 (-49%) 💚30
SOstream overhead (text)122 (-9.6%)344 🔴 (+20%) 🔻763 🔴 (+54%) 🔻1249 🔴 (+19%) 🔻30
SOstream overhead (structured)131 (-1.5%)276 🔴 (-45%) 💚659 🔴 (-23%) 💚2334 🔴 (-2.7%)30
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 155254ms → this run 147328ms (Δ -7926ms, -5%)
 50-100 ms ┃ main 0 this 1 +1
100-150 ms ██████████████████████░┃ main 667 this 734 +67
150-200 ms ███████┃█ main 276 this 230 -46
200-250 ms ┃ main 45 this 33 -12
250-300 ms ┃ main 10 this 9 -1
300-350 ms ┃ main 12 this 4 -8
350-400 ms ┃ main 5 this 6 +1
450-500 ms ┃ main 1 this 1 +0
800-850 ms ┃ main 1 this 1 +0
850-900 ms ┃ main 2 this 0 -2

📜 Previous results (3)
5ac32a8
Fri, 07 Aug 2026 22:36:47 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep273 (+5.4%)1481 🔴 (+35%) 🔻1499 🔴 (+30%) 🔻1548 🔴 (-0.6%)30
TTFSstream1327 (+637%) 🔻1409 🔴 (+35%) 🔻1423 🔴 (+32%) 🔻1558 🔴 (+30%) 🔻30
TTFShook + stream483 (+34%) 🔻1708 🔴 (+32%) 🔻1898 🔴 (+38%) 🔻5933 🔴 (+290%) 🔻30
STSO1020 steps (inline)103 (+2.0%)139 (-12%)159 (-16%) 💚255 (-25%) 💚1019
WO1020 steps138535 (-11%)138535 (-11%)138535 (-11%)138535 (-11%)1
SLstream latency104 (+16%) 🔻141 🔴 (-1.4%)337 🔴 (+56%) 🔻992 🔴 (+19%) 🔻30
SOstream overhead (text)139 (+3.0%)200 (-30%) 💚237 (-52%) 💚319 (-70%) 💚30
SOstream overhead (structured)123 (-7.5%)182 (-64%) 💚225 (-74%) 💚260 (-89%) 💚30
731c052
Fri, 07 Aug 2026 18:55:16 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep1319 (+24%) 🔻1465 🔴 (+23%) 🔻1545 🔴 (+23%) 🔻1920 🔴 (+8.2%)30
TTFSstream450 (-59%) 💚1445 🔴 (+18%) 🔻1481 🔴 (+17%) 🔻1553 🔴 (+15%)30
TTFShook + stream1423 (+4.5%)1690 🔴 (+14%)1725 🔴 (+13%)1838 🔴 (+11%)30
STSO1020 steps (inline)93 (-25%) 💚137 (-19%) 💚161 (-17%) 💚295 (-15%) 💚1019
WO1020 steps138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚1
SLstream latency97 (-17%) 💚148 🔴 (-12%)161 🔴 (-23%) 💚250 🔴 (-60%) 💚30
SOstream overhead (text)121 (-18%) 💚240 (+10%)300 (+8.3%)344 (-2.3%)30
SOstream overhead (structured)123 (-22%) 💚205 (-17%) 💚286 (-31%) 💚411 (-92%) 💚30
4fcdebf
Thu, 06 Aug 2026 23:18:57 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep233 (-75%) 💚1397 🔴 (+14%)1437 🔴 (+8.0%)1825 🔴 (+11%)30
TTFSstream259 (±0%)1419 🔴 (+19%) 🔻1484 🔴 (+22%) 🔻1716 🔴 (+34%) 🔻30
TTFShook + stream363 (-12%)1645 🔴 (+8.0%)1683 🔴 (+6.7%)1748 🔴 (-15%)30
STSO1020 steps (inline)98 (-7.5%)144 (-21%) 💚170 (-20%) 💚333 (-0.9%)1019
WO1020 steps144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚1
SLstream latency95 (-6.9%)133 🔴 (-28%) 💚153 🔴 (-50%) 💚871 🔴 (+54%) 🔻30
SOstream overhead (text)104 (-27%) 💚207 (-21%) 💚248 (-19%) 💚518 (+9.5%)30
SOstream overhead (structured)141 (-13%)296 🔴 (-23%) 💚383 (-26%) 💚865 (-2.1%)30
ℹ️ Metric definitions & methodology
The collapsed STSO distribution section above buckets every step gap of the sequential-steps run (not a sampled window), split by whether the step ending the gap ran inline — in the same warm process as the step before it, so the gap is pure framework overhead — or after a queue-hop — the first step of a fresh process, which pays queue dispatch, client reinit and event-log replay. Bars overlay the two runs: █ is main, ┃ marks where this run lands, ░ bridges the gap when this run has more samples in a bucket.
Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.
Metrics — TTFS: time to first step body (in-deployment start() → first step body, deployment clocks) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · SL: stream latency (in-deployment write → read propagation, readAt - writtenAt) · SO: stream overhead (end-to-end write+consume time beyond the modelled generation window)
Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · stream latency: parallel reader/writer steps on a dedicated stream; SL is the in-deployment write->read propagation (readAt - writtenAt) · stream overhead (text): writer streams 300 variable-length text token deltas paced at 100/s for 3s (a haiku-size LLM's token throughput) while a parallel reader drains the whole stream; SO is the end-to-end write+consume time beyond the 3s generation window (overhead/backpressure) · stream overhead (structured): same workload as stream overhead (text), but each delta is an AI-SDK-style structured object ({ type: 'text-delta', id, text }) instead of a raw string, so the SO gap vs the text scenario is the added serialization cost
🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · SO 250/500/1000
All metrics are measured from deployment-side timestamps only. Runs are triggered by an in-deployment route that stamps the anchor (clientStart) right before start(), so the CI runner’s request and its path through api.vercel.com sit outside every measured window. TTFS = in-deployment start() → first step body (turbo uses the in-process fast path, non-turbo the dispatch path), and includes the VQS dispatch hop plus any /flow cold start. STSO/WO are measured between step bodies on the deployment. SL is measured inside the workflow (parallel reader/writer steps), so it no longer includes the api.vercel.com read path.
Cold starts are kept in the numbers on purpose — they are part of real bursty-workload latency. The workbench deployment cold-starts the /flow invocation for a large fraction of runs, inflating P75+; the Best column shows the fastest (warm-start) sample for comparison.
vercel[bot]
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Aug 3, 2026
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Comment threadpackages/world-vercel/src/events.ts
@NathanColosimo
Fix out-of-order run lifecycle replay
9235160
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
0ea6dc3
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e41dcb2
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
565e9b2
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
b8d6800
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
9ea5231
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
414e4cd
…ream-run-started-replay-page
# Conflicts:
#	packages/world-vercel/src/events.ts
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
c712106
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
b0db86b
…ream-run-started-replay-page
@NathanColosimo
Merge commit '9eafd6c638b51fc1c905a16872e091fac8f273ea' into codex/st…
9573503
…ream-run-started-replay-page
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
perf(core): load replay log from run_started by NathanColosimo · Pull Request #3191 · vercel/workflow · GitHub
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perf(core): load replay log from run_started - #3191
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perf(core): load replay log from run_started#3191
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Summary
  • consume run_started as the same plain event-frame stream used by event listing, with no separate creation-result frame or parser state
  • reconstruct the started run by event type instead of array position, including later attribute changes
  • receive the current replay log in the run_started HTTP response and continue from its trailing cursor only when the bounded response reports hasMore
  • keep CBOR only for skipPreload and other event writes
  • preserve the Turbo path: background run_started, request skipPreload, synthesize the run, and begin replay immediately
  • reuse one strict event-frame decoder for listing and run_started, preserving opaque compressed payloads until runtime hydration
Stack
Stacked on #3124.
Validation
  • package build for @workflow/world-vercel and dependencies
  • pnpm --filter @workflow/world-vercel typecheck
  • pnpm --filter @workflow/world-vercel test — 339 passed
  • changed-file Biome formatting and lint checks
  • paired prerequisite compatibility run — all 13 production targets and the multi-region suite passed
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreviewAug 7, 2026 11:35pm
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🦋 Changeset detected
Latest commit: 1e8940d
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 17 packages
NameType
@workflow/world-vercelPatch
@workflow/cliPatch
@workflow/corePatch
@workflow/webPatch
workflowPatch
@workflow/world-testingPatch
@workflow/buildersPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
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@workflow/nuxtPatch
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🧪 E2E Test Results
✅ All tests passed
E2E Test Summary
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production295404783432
✅ 💻 Local Development329004543744
✅ 📦 Local Production329004543744
✅ 🐘 Local Postgres329004543744
✅ 🪟 Windows31200312
✅ 📋 Other207204242496
✅ vercel-multi-region270027
Total152350226417499
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node128028
✅ astro-quickjs128028
✅ example-node128028
✅ example-quickjs128028
✅ express-node128028
✅ express-quickjs128028
✅ fastify-node128028
✅ fastify-quickjs128028
✅ hono-node128028
✅ hono-quickjs128028
✅ nextjs-turbopack-node15303
✅ nextjs-turbopack-quickjs15303
✅ nextjs-webpack-node15303
✅ nextjs-webpack-quickjs15303
✅ nitro-node128028
✅ nitro-quickjs128028
✅ nuxt-node128028
✅ nuxt-quickjs128028
✅ sveltekit-node14709
✅ sveltekit-quickjs14709
✅ vite-node128028
✅ vite-quickjs128028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🐘 Local Postgres
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✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🪟 Windows
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✅ nextjs-turbopack-quickjs15600
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✅ e2e-local-dev-tanstack-start-quickjs130026
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✅ e2e-local-postgres-nest-stable-quickjs130026
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LGMT but tests seem very flaky - let's hold until we verify e2e passes consistently
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📊 Workflow Benchmarks
commit 1e8940d · Fri, 07 Aug 2026 23:49:35 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep240 (-7.3%)1369 🔴 (+25%) 🔻1405 🔴 (+22%) 🔻1715 🔴 (+10%)30
TTFSstream251 (+39%) 🔻1340 🔴 (+28%) 🔻1386 🔴 (+28%) 🔻1413 🔴 (+18%) 🔻30
TTFShook + stream321 (-11%)1587 🔴 (+22%) 🔻1603 🔴 (+16%) 🔻1662 🔴 (+9.3%)30
STSO1020 steps (inline)98 (-3.0%)152 (-3.8%)177 (-6.3%)310 (-8.6%)1019
WO1020 steps148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)1
SLstream latency92 (+2.2%)138 🔴 (-3.5%)193 🔴 (-11%)428 🔴 (-49%) 💚30
SOstream overhead (text)122 (-9.6%)344 🔴 (+20%) 🔻763 🔴 (+54%) 🔻1249 🔴 (+19%) 🔻30
SOstream overhead (structured)131 (-1.5%)276 🔴 (-45%) 💚659 🔴 (-23%) 💚2334 🔴 (-2.7%)30
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 155254ms → this run 147328ms (Δ -7926ms, -5%)
 50-100 ms ┃ main 0 this 1 +1
100-150 ms ██████████████████████░┃ main 667 this 734 +67
150-200 ms ███████┃█ main 276 this 230 -46
200-250 ms ┃ main 45 this 33 -12
250-300 ms ┃ main 10 this 9 -1
300-350 ms ┃ main 12 this 4 -8
350-400 ms ┃ main 5 this 6 +1
450-500 ms ┃ main 1 this 1 +0
800-850 ms ┃ main 1 this 1 +0
850-900 ms ┃ main 2 this 0 -2

📜 Previous results (3)
5ac32a8
Fri, 07 Aug 2026 22:36:47 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep273 (+5.4%)1481 🔴 (+35%) 🔻1499 🔴 (+30%) 🔻1548 🔴 (-0.6%)30
TTFSstream1327 (+637%) 🔻1409 🔴 (+35%) 🔻1423 🔴 (+32%) 🔻1558 🔴 (+30%) 🔻30
TTFShook + stream483 (+34%) 🔻1708 🔴 (+32%) 🔻1898 🔴 (+38%) 🔻5933 🔴 (+290%) 🔻30
STSO1020 steps (inline)103 (+2.0%)139 (-12%)159 (-16%) 💚255 (-25%) 💚1019
WO1020 steps138535 (-11%)138535 (-11%)138535 (-11%)138535 (-11%)1
SLstream latency104 (+16%) 🔻141 🔴 (-1.4%)337 🔴 (+56%) 🔻992 🔴 (+19%) 🔻30
SOstream overhead (text)139 (+3.0%)200 (-30%) 💚237 (-52%) 💚319 (-70%) 💚30
SOstream overhead (structured)123 (-7.5%)182 (-64%) 💚225 (-74%) 💚260 (-89%) 💚30
731c052
Fri, 07 Aug 2026 18:55:16 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep1319 (+24%) 🔻1465 🔴 (+23%) 🔻1545 🔴 (+23%) 🔻1920 🔴 (+8.2%)30
TTFSstream450 (-59%) 💚1445 🔴 (+18%) 🔻1481 🔴 (+17%) 🔻1553 🔴 (+15%)30
TTFShook + stream1423 (+4.5%)1690 🔴 (+14%)1725 🔴 (+13%)1838 🔴 (+11%)30
STSO1020 steps (inline)93 (-25%) 💚137 (-19%) 💚161 (-17%) 💚295 (-15%) 💚1019
WO1020 steps138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚1
SLstream latency97 (-17%) 💚148 🔴 (-12%)161 🔴 (-23%) 💚250 🔴 (-60%) 💚30
SOstream overhead (text)121 (-18%) 💚240 (+10%)300 (+8.3%)344 (-2.3%)30
SOstream overhead (structured)123 (-22%) 💚205 (-17%) 💚286 (-31%) 💚411 (-92%) 💚30
4fcdebf
Thu, 06 Aug 2026 23:18:57 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep233 (-75%) 💚1397 🔴 (+14%)1437 🔴 (+8.0%)1825 🔴 (+11%)30
TTFSstream259 (±0%)1419 🔴 (+19%) 🔻1484 🔴 (+22%) 🔻1716 🔴 (+34%) 🔻30
TTFShook + stream363 (-12%)1645 🔴 (+8.0%)1683 🔴 (+6.7%)1748 🔴 (-15%)30
STSO1020 steps (inline)98 (-7.5%)144 (-21%) 💚170 (-20%) 💚333 (-0.9%)1019
WO1020 steps144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚1
SLstream latency95 (-6.9%)133 🔴 (-28%) 💚153 🔴 (-50%) 💚871 🔴 (+54%) 🔻30
SOstream overhead (text)104 (-27%) 💚207 (-21%) 💚248 (-19%) 💚518 (+9.5%)30
SOstream overhead (structured)141 (-13%)296 🔴 (-23%) 💚383 (-26%) 💚865 (-2.1%)30
ℹ️ Metric definitions & methodology
The collapsed STSO distribution section above buckets every step gap of the sequential-steps run (not a sampled window), split by whether the step ending the gap ran inline — in the same warm process as the step before it, so the gap is pure framework overhead — or after a queue-hop — the first step of a fresh process, which pays queue dispatch, client reinit and event-log replay. Bars overlay the two runs: █ is main, ┃ marks where this run lands, ░ bridges the gap when this run has more samples in a bucket.
Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.
Metrics — TTFS: time to first step body (in-deployment start() → first step body, deployment clocks) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · SL: stream latency (in-deployment write → read propagation, readAt - writtenAt) · SO: stream overhead (end-to-end write+consume time beyond the modelled generation window)
Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · stream latency: parallel reader/writer steps on a dedicated stream; SL is the in-deployment write->read propagation (readAt - writtenAt) · stream overhead (text): writer streams 300 variable-length text token deltas paced at 100/s for 3s (a haiku-size LLM's token throughput) while a parallel reader drains the whole stream; SO is the end-to-end write+consume time beyond the 3s generation window (overhead/backpressure) · stream overhead (structured): same workload as stream overhead (text), but each delta is an AI-SDK-style structured object ({ type: 'text-delta', id, text }) instead of a raw string, so the SO gap vs the text scenario is the added serialization cost
🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · SO 250/500/1000
All metrics are measured from deployment-side timestamps only. Runs are triggered by an in-deployment route that stamps the anchor (clientStart) right before start(), so the CI runner’s request and its path through api.vercel.com sit outside every measured window. TTFS = in-deployment start() → first step body (turbo uses the in-process fast path, non-turbo the dispatch path), and includes the VQS dispatch hop plus any /flow cold start. STSO/WO are measured between step bodies on the deployment. SL is measured inside the workflow (parallel reader/writer steps), so it no longer includes the api.vercel.com read path.
Cold starts are kept in the numbers on purpose — they are part of real bursty-workload latency. The workbench deployment cold-starts the /flow invocation for a large fraction of runs, inflating P75+; the Best column shows the fastest (warm-start) sample for comparison.
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Aug 3, 2026
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Comment threadpackages/world-vercel/src/events.ts
@NathanColosimo
Fix out-of-order run lifecycle replay
9235160
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
0ea6dc3
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e41dcb2
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e05435e
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
565e9b2
…d-cursor' into codex/stream-run-started-replay-page
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
414e4cd
…ream-run-started-replay-page
# Conflicts:
#	packages/world-vercel/src/events.ts
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
c712106
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
b0db86b
…ream-run-started-replay-page
@NathanColosimo
Merge commit '9eafd6c638b51fc1c905a16872e091fac8f273ea' into codex/st…
9573503
…ream-run-started-replay-page
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if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
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perf(core): load replay log from run_started by NathanColosimo · Pull Request #3191 · vercel/workflow · GitHub
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perf(core): load replay log from run_started - #3191
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perf(core): load replay log from run_started#3191
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Summary
  • consume run_started as the same plain event-frame stream used by event listing, with no separate creation-result frame or parser state
  • reconstruct the started run by event type instead of array position, including later attribute changes
  • receive the current replay log in the run_started HTTP response and continue from its trailing cursor only when the bounded response reports hasMore
  • keep CBOR only for skipPreload and other event writes
  • preserve the Turbo path: background run_started, request skipPreload, synthesize the run, and begin replay immediately
  • reuse one strict event-frame decoder for listing and run_started, preserving opaque compressed payloads until runtime hydration
Stack
Stacked on #3124.
Validation
  • package build for @workflow/world-vercel and dependencies
  • pnpm --filter @workflow/world-vercel typecheck
  • pnpm --filter @workflow/world-vercel test — 339 passed
  • changed-file Biome formatting and lint checks
  • paired prerequisite compatibility run — all 13 production targets and the multi-region suite passed
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🦋 Changeset detected
Latest commit: 1e8940d
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 17 packages
NameType
@workflow/world-vercelPatch
@workflow/cliPatch
@workflow/corePatch
@workflow/webPatch
workflowPatch
@workflow/world-testingPatch
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@workflow/nextPatch
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@workflow/web-sharedPatch
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🧪 E2E Test Results
✅ All tests passed
E2E Test Summary
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production295404783432
✅ 💻 Local Development329004543744
✅ 📦 Local Production329004543744
✅ 🐘 Local Postgres329004543744
✅ 🪟 Windows31200312
✅ 📋 Other207204242496
✅ vercel-multi-region270027
Total152350226417499
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node128028
✅ astro-quickjs128028
✅ example-node128028
✅ example-quickjs128028
✅ express-node128028
✅ express-quickjs128028
✅ fastify-node128028
✅ fastify-quickjs128028
✅ hono-node128028
✅ hono-quickjs128028
✅ nextjs-turbopack-node15303
✅ nextjs-turbopack-quickjs15303
✅ nextjs-webpack-node15303
✅ nextjs-webpack-quickjs15303
✅ nitro-node128028
✅ nitro-quickjs128028
✅ nuxt-node128028
✅ nuxt-quickjs128028
✅ sveltekit-node14709
✅ sveltekit-quickjs14709
✅ vite-node128028
✅ vite-quickjs128028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack-node15600
✅ nextjs-turbopack-quickjs15600
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable-node130026
✅ e2e-local-dev-nest-stable-quickjs130026
✅ e2e-local-dev-tanstack-start-node130026
✅ e2e-local-dev-tanstack-start-quickjs130026
✅ e2e-local-postgres-nest-stable-node130026
✅ e2e-local-postgres-nest-stable-quickjs130026
✅ e2e-local-postgres-tanstack-start-node130026
✅ e2e-local-postgres-tanstack-start-quickjs130026
✅ e2e-local-prod-nest-stable-node130026
✅ e2e-local-prod-nest-stable-quickjs130026
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LGMT but tests seem very flaky - let's hold until we verify e2e passes consistently
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📊 Workflow Benchmarks
commit 1e8940d · Fri, 07 Aug 2026 23:49:35 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep240 (-7.3%)1369 🔴 (+25%) 🔻1405 🔴 (+22%) 🔻1715 🔴 (+10%)30
TTFSstream251 (+39%) 🔻1340 🔴 (+28%) 🔻1386 🔴 (+28%) 🔻1413 🔴 (+18%) 🔻30
TTFShook + stream321 (-11%)1587 🔴 (+22%) 🔻1603 🔴 (+16%) 🔻1662 🔴 (+9.3%)30
STSO1020 steps (inline)98 (-3.0%)152 (-3.8%)177 (-6.3%)310 (-8.6%)1019
WO1020 steps148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)1
SLstream latency92 (+2.2%)138 🔴 (-3.5%)193 🔴 (-11%)428 🔴 (-49%) 💚30
SOstream overhead (text)122 (-9.6%)344 🔴 (+20%) 🔻763 🔴 (+54%) 🔻1249 🔴 (+19%) 🔻30
SOstream overhead (structured)131 (-1.5%)276 🔴 (-45%) 💚659 🔴 (-23%) 💚2334 🔴 (-2.7%)30
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 155254ms → this run 147328ms (Δ -7926ms, -5%)
 50-100 ms ┃ main 0 this 1 +1
100-150 ms ██████████████████████░┃ main 667 this 734 +67
150-200 ms ███████┃█ main 276 this 230 -46
200-250 ms ┃ main 45 this 33 -12
250-300 ms ┃ main 10 this 9 -1
300-350 ms ┃ main 12 this 4 -8
350-400 ms ┃ main 5 this 6 +1
450-500 ms ┃ main 1 this 1 +0
800-850 ms ┃ main 1 this 1 +0
850-900 ms ┃ main 2 this 0 -2

📜 Previous results (3)
5ac32a8
Fri, 07 Aug 2026 22:36:47 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep273 (+5.4%)1481 🔴 (+35%) 🔻1499 🔴 (+30%) 🔻1548 🔴 (-0.6%)30
TTFSstream1327 (+637%) 🔻1409 🔴 (+35%) 🔻1423 🔴 (+32%) 🔻1558 🔴 (+30%) 🔻30
TTFShook + stream483 (+34%) 🔻1708 🔴 (+32%) 🔻1898 🔴 (+38%) 🔻5933 🔴 (+290%) 🔻30
STSO1020 steps (inline)103 (+2.0%)139 (-12%)159 (-16%) 💚255 (-25%) 💚1019
WO1020 steps138535 (-11%)138535 (-11%)138535 (-11%)138535 (-11%)1
SLstream latency104 (+16%) 🔻141 🔴 (-1.4%)337 🔴 (+56%) 🔻992 🔴 (+19%) 🔻30
SOstream overhead (text)139 (+3.0%)200 (-30%) 💚237 (-52%) 💚319 (-70%) 💚30
SOstream overhead (structured)123 (-7.5%)182 (-64%) 💚225 (-74%) 💚260 (-89%) 💚30
731c052
Fri, 07 Aug 2026 18:55:16 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep1319 (+24%) 🔻1465 🔴 (+23%) 🔻1545 🔴 (+23%) 🔻1920 🔴 (+8.2%)30
TTFSstream450 (-59%) 💚1445 🔴 (+18%) 🔻1481 🔴 (+17%) 🔻1553 🔴 (+15%)30
TTFShook + stream1423 (+4.5%)1690 🔴 (+14%)1725 🔴 (+13%)1838 🔴 (+11%)30
STSO1020 steps (inline)93 (-25%) 💚137 (-19%) 💚161 (-17%) 💚295 (-15%) 💚1019
WO1020 steps138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚1
SLstream latency97 (-17%) 💚148 🔴 (-12%)161 🔴 (-23%) 💚250 🔴 (-60%) 💚30
SOstream overhead (text)121 (-18%) 💚240 (+10%)300 (+8.3%)344 (-2.3%)30
SOstream overhead (structured)123 (-22%) 💚205 (-17%) 💚286 (-31%) 💚411 (-92%) 💚30
4fcdebf
Thu, 06 Aug 2026 23:18:57 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep233 (-75%) 💚1397 🔴 (+14%)1437 🔴 (+8.0%)1825 🔴 (+11%)30
TTFSstream259 (±0%)1419 🔴 (+19%) 🔻1484 🔴 (+22%) 🔻1716 🔴 (+34%) 🔻30
TTFShook + stream363 (-12%)1645 🔴 (+8.0%)1683 🔴 (+6.7%)1748 🔴 (-15%)30
STSO1020 steps (inline)98 (-7.5%)144 (-21%) 💚170 (-20%) 💚333 (-0.9%)1019
WO1020 steps144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚1
SLstream latency95 (-6.9%)133 🔴 (-28%) 💚153 🔴 (-50%) 💚871 🔴 (+54%) 🔻30
SOstream overhead (text)104 (-27%) 💚207 (-21%) 💚248 (-19%) 💚518 (+9.5%)30
SOstream overhead (structured)141 (-13%)296 🔴 (-23%) 💚383 (-26%) 💚865 (-2.1%)30
ℹ️ Metric definitions & methodology
The collapsed STSO distribution section above buckets every step gap of the sequential-steps run (not a sampled window), split by whether the step ending the gap ran inline — in the same warm process as the step before it, so the gap is pure framework overhead — or after a queue-hop — the first step of a fresh process, which pays queue dispatch, client reinit and event-log replay. Bars overlay the two runs: █ is main, ┃ marks where this run lands, ░ bridges the gap when this run has more samples in a bucket.
Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.
Metrics — TTFS: time to first step body (in-deployment start() → first step body, deployment clocks) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · SL: stream latency (in-deployment write → read propagation, readAt - writtenAt) · SO: stream overhead (end-to-end write+consume time beyond the modelled generation window)
Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · stream latency: parallel reader/writer steps on a dedicated stream; SL is the in-deployment write->read propagation (readAt - writtenAt) · stream overhead (text): writer streams 300 variable-length text token deltas paced at 100/s for 3s (a haiku-size LLM's token throughput) while a parallel reader drains the whole stream; SO is the end-to-end write+consume time beyond the 3s generation window (overhead/backpressure) · stream overhead (structured): same workload as stream overhead (text), but each delta is an AI-SDK-style structured object ({ type: 'text-delta', id, text }) instead of a raw string, so the SO gap vs the text scenario is the added serialization cost
🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · SO 250/500/1000
All metrics are measured from deployment-side timestamps only. Runs are triggered by an in-deployment route that stamps the anchor (clientStart) right before start(), so the CI runner’s request and its path through api.vercel.com sit outside every measured window. TTFS = in-deployment start() → first step body (turbo uses the in-process fast path, non-turbo the dispatch path), and includes the VQS dispatch hop plus any /flow cold start. STSO/WO are measured between step bodies on the deployment. SL is measured inside the workflow (parallel reader/writer steps), so it no longer includes the api.vercel.com read path.
Cold starts are kept in the numbers on purpose — they are part of real bursty-workload latency. The workbench deployment cold-starts the /flow invocation for a large fraction of runs, inflating P75+; the Best column shows the fastest (warm-start) sample for comparison.
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Comment threadpackages/world-vercel/src/events.ts
@NathanColosimo
Fix out-of-order run lifecycle replay
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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…d-cursor' into codex/stream-run-started-replay-page
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
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…ream-run-started-replay-page
# Conflicts:
#	packages/world-vercel/src/events.ts
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Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
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Merge commit '9eafd6c638b51fc1c905a16872e091fac8f273ea' into codex/st…
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perf(core): load replay log from run_started by NathanColosimo · Pull Request #3191 · vercel/workflow · GitHub
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perf(core): load replay log from run_started - #3191
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Summary
  • consume run_started as the same plain event-frame stream used by event listing, with no separate creation-result frame or parser state
  • reconstruct the started run by event type instead of array position, including later attribute changes
  • receive the current replay log in the run_started HTTP response and continue from its trailing cursor only when the bounded response reports hasMore
  • keep CBOR only for skipPreload and other event writes
  • preserve the Turbo path: background run_started, request skipPreload, synthesize the run, and begin replay immediately
  • reuse one strict event-frame decoder for listing and run_started, preserving opaque compressed payloads until runtime hydration
Stack
Stacked on #3124.
Validation
  • package build for @workflow/world-vercel and dependencies
  • pnpm --filter @workflow/world-vercel typecheck
  • pnpm --filter @workflow/world-vercel test — 339 passed
  • changed-file Biome formatting and lint checks
  • paired prerequisite compatibility run — all 13 production targets and the multi-region suite passed
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🦋 Changeset detected
Latest commit: 1e8940d
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 17 packages
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@workflow/world-vercelPatch
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🧪 E2E Test Results
✅ All tests passed
E2E Test Summary
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production295404783432
✅ 💻 Local Development329004543744
✅ 📦 Local Production329004543744
✅ 🐘 Local Postgres329004543744
✅ 🪟 Windows31200312
✅ 📋 Other207204242496
✅ vercel-multi-region270027
Total152350226417499
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node128028
✅ astro-quickjs128028
✅ example-node128028
✅ example-quickjs128028
✅ express-node128028
✅ express-quickjs128028
✅ fastify-node128028
✅ fastify-quickjs128028
✅ hono-node128028
✅ hono-quickjs128028
✅ nextjs-turbopack-node15303
✅ nextjs-turbopack-quickjs15303
✅ nextjs-webpack-node15303
✅ nextjs-webpack-quickjs15303
✅ nitro-node128028
✅ nitro-quickjs128028
✅ nuxt-node128028
✅ nuxt-quickjs128028
✅ sveltekit-node14709
✅ sveltekit-quickjs14709
✅ vite-node128028
✅ vite-quickjs128028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
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✅ 📦 Local Production
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✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack-node15600
✅ nextjs-turbopack-quickjs15600
✅ 📋 Other
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✅ e2e-local-dev-nest-stable-node130026
✅ e2e-local-dev-nest-stable-quickjs130026
✅ e2e-local-dev-tanstack-start-node130026
✅ e2e-local-dev-tanstack-start-quickjs130026
✅ e2e-local-postgres-nest-stable-node130026
✅ e2e-local-postgres-nest-stable-quickjs130026
✅ e2e-local-postgres-tanstack-start-node130026
✅ e2e-local-postgres-tanstack-start-quickjs130026
✅ e2e-local-prod-nest-stable-node130026
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✅ e2e-vercel-prod-nest-node128028
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✅ e2e-vercel-prod-tanstack-start-node128028
✅ e2e-vercel-prod-tanstack-start-quickjs128028
✅ vercel-multi-region
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✅ nextjs-turbopack2700
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LGMT but tests seem very flaky - let's hold until we verify e2e passes consistently
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📊 Workflow Benchmarks
commit 1e8940d · Fri, 07 Aug 2026 23:49:35 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep240 (-7.3%)1369 🔴 (+25%) 🔻1405 🔴 (+22%) 🔻1715 🔴 (+10%)30
TTFSstream251 (+39%) 🔻1340 🔴 (+28%) 🔻1386 🔴 (+28%) 🔻1413 🔴 (+18%) 🔻30
TTFShook + stream321 (-11%)1587 🔴 (+22%) 🔻1603 🔴 (+16%) 🔻1662 🔴 (+9.3%)30
STSO1020 steps (inline)98 (-3.0%)152 (-3.8%)177 (-6.3%)310 (-8.6%)1019
WO1020 steps148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)1
SLstream latency92 (+2.2%)138 🔴 (-3.5%)193 🔴 (-11%)428 🔴 (-49%) 💚30
SOstream overhead (text)122 (-9.6%)344 🔴 (+20%) 🔻763 🔴 (+54%) 🔻1249 🔴 (+19%) 🔻30
SOstream overhead (structured)131 (-1.5%)276 🔴 (-45%) 💚659 🔴 (-23%) 💚2334 🔴 (-2.7%)30
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 155254ms → this run 147328ms (Δ -7926ms, -5%)
 50-100 ms ┃ main 0 this 1 +1
100-150 ms ██████████████████████░┃ main 667 this 734 +67
150-200 ms ███████┃█ main 276 this 230 -46
200-250 ms ┃ main 45 this 33 -12
250-300 ms ┃ main 10 this 9 -1
300-350 ms ┃ main 12 this 4 -8
350-400 ms ┃ main 5 this 6 +1
450-500 ms ┃ main 1 this 1 +0
800-850 ms ┃ main 1 this 1 +0
850-900 ms ┃ main 2 this 0 -2

📜 Previous results (3)
5ac32a8
Fri, 07 Aug 2026 22:36:47 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep273 (+5.4%)1481 🔴 (+35%) 🔻1499 🔴 (+30%) 🔻1548 🔴 (-0.6%)30
TTFSstream1327 (+637%) 🔻1409 🔴 (+35%) 🔻1423 🔴 (+32%) 🔻1558 🔴 (+30%) 🔻30
TTFShook + stream483 (+34%) 🔻1708 🔴 (+32%) 🔻1898 🔴 (+38%) 🔻5933 🔴 (+290%) 🔻30
STSO1020 steps (inline)103 (+2.0%)139 (-12%)159 (-16%) 💚255 (-25%) 💚1019
WO1020 steps138535 (-11%)138535 (-11%)138535 (-11%)138535 (-11%)1
SLstream latency104 (+16%) 🔻141 🔴 (-1.4%)337 🔴 (+56%) 🔻992 🔴 (+19%) 🔻30
SOstream overhead (text)139 (+3.0%)200 (-30%) 💚237 (-52%) 💚319 (-70%) 💚30
SOstream overhead (structured)123 (-7.5%)182 (-64%) 💚225 (-74%) 💚260 (-89%) 💚30
731c052
Fri, 07 Aug 2026 18:55:16 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep1319 (+24%) 🔻1465 🔴 (+23%) 🔻1545 🔴 (+23%) 🔻1920 🔴 (+8.2%)30
TTFSstream450 (-59%) 💚1445 🔴 (+18%) 🔻1481 🔴 (+17%) 🔻1553 🔴 (+15%)30
TTFShook + stream1423 (+4.5%)1690 🔴 (+14%)1725 🔴 (+13%)1838 🔴 (+11%)30
STSO1020 steps (inline)93 (-25%) 💚137 (-19%) 💚161 (-17%) 💚295 (-15%) 💚1019
WO1020 steps138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚1
SLstream latency97 (-17%) 💚148 🔴 (-12%)161 🔴 (-23%) 💚250 🔴 (-60%) 💚30
SOstream overhead (text)121 (-18%) 💚240 (+10%)300 (+8.3%)344 (-2.3%)30
SOstream overhead (structured)123 (-22%) 💚205 (-17%) 💚286 (-31%) 💚411 (-92%) 💚30
4fcdebf
Thu, 06 Aug 2026 23:18:57 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep233 (-75%) 💚1397 🔴 (+14%)1437 🔴 (+8.0%)1825 🔴 (+11%)30
TTFSstream259 (±0%)1419 🔴 (+19%) 🔻1484 🔴 (+22%) 🔻1716 🔴 (+34%) 🔻30
TTFShook + stream363 (-12%)1645 🔴 (+8.0%)1683 🔴 (+6.7%)1748 🔴 (-15%)30
STSO1020 steps (inline)98 (-7.5%)144 (-21%) 💚170 (-20%) 💚333 (-0.9%)1019
WO1020 steps144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚1
SLstream latency95 (-6.9%)133 🔴 (-28%) 💚153 🔴 (-50%) 💚871 🔴 (+54%) 🔻30
SOstream overhead (text)104 (-27%) 💚207 (-21%) 💚248 (-19%) 💚518 (+9.5%)30
SOstream overhead (structured)141 (-13%)296 🔴 (-23%) 💚383 (-26%) 💚865 (-2.1%)30
ℹ️ Metric definitions & methodology
The collapsed STSO distribution section above buckets every step gap of the sequential-steps run (not a sampled window), split by whether the step ending the gap ran inline — in the same warm process as the step before it, so the gap is pure framework overhead — or after a queue-hop — the first step of a fresh process, which pays queue dispatch, client reinit and event-log replay. Bars overlay the two runs: █ is main, ┃ marks where this run lands, ░ bridges the gap when this run has more samples in a bucket.
Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.
Metrics — TTFS: time to first step body (in-deployment start() → first step body, deployment clocks) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · SL: stream latency (in-deployment write → read propagation, readAt - writtenAt) · SO: stream overhead (end-to-end write+consume time beyond the modelled generation window)
Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · stream latency: parallel reader/writer steps on a dedicated stream; SL is the in-deployment write->read propagation (readAt - writtenAt) · stream overhead (text): writer streams 300 variable-length text token deltas paced at 100/s for 3s (a haiku-size LLM's token throughput) while a parallel reader drains the whole stream; SO is the end-to-end write+consume time beyond the 3s generation window (overhead/backpressure) · stream overhead (structured): same workload as stream overhead (text), but each delta is an AI-SDK-style structured object ({ type: 'text-delta', id, text }) instead of a raw string, so the SO gap vs the text scenario is the added serialization cost
🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · SO 250/500/1000
All metrics are measured from deployment-side timestamps only. Runs are triggered by an in-deployment route that stamps the anchor (clientStart) right before start(), so the CI runner’s request and its path through api.vercel.com sit outside every measured window. TTFS = in-deployment start() → first step body (turbo uses the in-process fast path, non-turbo the dispatch path), and includes the VQS dispatch hop plus any /flow cold start. STSO/WO are measured between step bodies on the deployment. SL is measured inside the workflow (parallel reader/writer steps), so it no longer includes the api.vercel.com read path.
Cold starts are kept in the numbers on purpose — they are part of real bursty-workload latency. The workbench deployment cold-starts the /flow invocation for a large fraction of runs, inflating P75+; the Best column shows the fastest (warm-start) sample for comparison.
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Comment threadpackages/world-vercel/src/events.ts
@NathanColosimo
Fix out-of-order run lifecycle replay
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
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Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
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…ream-run-started-replay-page
# Conflicts:
#	packages/world-vercel/src/events.ts
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Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
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Merge commit '9eafd6c638b51fc1c905a16872e091fac8f273ea' into codex/st…
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perf(core): load replay log from run_started by NathanColosimo · Pull Request #3191 · vercel/workflow · GitHub
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perf(core): load replay log from run_started - #3191
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perf(core): load replay log from run_started#3191
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Summary
  • consume run_started as the same plain event-frame stream used by event listing, with no separate creation-result frame or parser state
  • reconstruct the started run by event type instead of array position, including later attribute changes
  • receive the current replay log in the run_started HTTP response and continue from its trailing cursor only when the bounded response reports hasMore
  • keep CBOR only for skipPreload and other event writes
  • preserve the Turbo path: background run_started, request skipPreload, synthesize the run, and begin replay immediately
  • reuse one strict event-frame decoder for listing and run_started, preserving opaque compressed payloads until runtime hydration
Stack
Stacked on #3124.
Validation
  • package build for @workflow/world-vercel and dependencies
  • pnpm --filter @workflow/world-vercel typecheck
  • pnpm --filter @workflow/world-vercel test — 339 passed
  • changed-file Biome formatting and lint checks
  • paired prerequisite compatibility run — all 13 production targets and the multi-region suite passed
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🦋 Changeset detected
Latest commit: 1e8940d
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 17 packages
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🧪 E2E Test Results
✅ All tests passed
E2E Test Summary
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production295404783432
✅ 💻 Local Development329004543744
✅ 📦 Local Production329004543744
✅ 🐘 Local Postgres329004543744
✅ 🪟 Windows31200312
✅ 📋 Other207204242496
✅ vercel-multi-region270027
Total152350226417499
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node128028
✅ astro-quickjs128028
✅ example-node128028
✅ example-quickjs128028
✅ express-node128028
✅ express-quickjs128028
✅ fastify-node128028
✅ fastify-quickjs128028
✅ hono-node128028
✅ hono-quickjs128028
✅ nextjs-turbopack-node15303
✅ nextjs-turbopack-quickjs15303
✅ nextjs-webpack-node15303
✅ nextjs-webpack-quickjs15303
✅ nitro-node128028
✅ nitro-quickjs128028
✅ nuxt-node128028
✅ nuxt-quickjs128028
✅ sveltekit-node14709
✅ sveltekit-quickjs14709
✅ vite-node128028
✅ vite-quickjs128028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node130026
✅ astro-stable-quickjs130026
✅ express-stable-node130026
✅ express-stable-quickjs130026
✅ fastify-stable-node130026
✅ fastify-stable-quickjs130026
✅ hono-stable-node130026
✅ hono-stable-quickjs130026
✅ nextjs-turbopack-canary-node137019
✅ nextjs-turbopack-canary-quickjs137019
✅ nextjs-turbopack-stable-node15600
✅ nextjs-turbopack-stable-quickjs15600
✅ nextjs-webpack-canary-node137019
✅ nextjs-webpack-canary-quickjs137019
✅ nextjs-webpack-stable-node15600
✅ nextjs-webpack-stable-quickjs15600
✅ nitro-stable-node130026
✅ nitro-stable-quickjs130026
✅ nuxt-stable-node130026
✅ nuxt-stable-quickjs130026
✅ sveltekit-stable-node14907
✅ sveltekit-stable-quickjs14907
✅ vite-stable-node130026
✅ vite-stable-quickjs130026
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack-node15600
✅ nextjs-turbopack-quickjs15600
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable-node130026
✅ e2e-local-dev-nest-stable-quickjs130026
✅ e2e-local-dev-tanstack-start-node130026
✅ e2e-local-dev-tanstack-start-quickjs130026
✅ e2e-local-postgres-nest-stable-node130026
✅ e2e-local-postgres-nest-stable-quickjs130026
✅ e2e-local-postgres-tanstack-start-node130026
✅ e2e-local-postgres-tanstack-start-quickjs130026
✅ e2e-local-prod-nest-stable-node130026
✅ e2e-local-prod-nest-stable-quickjs130026
✅ e2e-local-prod-tanstack-start-node130026
✅ e2e-local-prod-tanstack-start-quickjs130026
✅ e2e-vercel-prod-nest-node128028
✅ e2e-vercel-prod-nest-quickjs128028
✅ e2e-vercel-prod-tanstack-start-node128028
✅ e2e-vercel-prod-tanstack-start-quickjs128028
✅ vercel-multi-region
AppPassedFailedSkipped
✅ nextjs-turbopack2700
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LGMT but tests seem very flaky - let's hold until we verify e2e passes consistently
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📊 Workflow Benchmarks
commit 1e8940d · Fri, 07 Aug 2026 23:49:35 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep240 (-7.3%)1369 🔴 (+25%) 🔻1405 🔴 (+22%) 🔻1715 🔴 (+10%)30
TTFSstream251 (+39%) 🔻1340 🔴 (+28%) 🔻1386 🔴 (+28%) 🔻1413 🔴 (+18%) 🔻30
TTFShook + stream321 (-11%)1587 🔴 (+22%) 🔻1603 🔴 (+16%) 🔻1662 🔴 (+9.3%)30
STSO1020 steps (inline)98 (-3.0%)152 (-3.8%)177 (-6.3%)310 (-8.6%)1019
WO1020 steps148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)148673 (-4.9%)1
SLstream latency92 (+2.2%)138 🔴 (-3.5%)193 🔴 (-11%)428 🔴 (-49%) 💚30
SOstream overhead (text)122 (-9.6%)344 🔴 (+20%) 🔻763 🔴 (+54%) 🔻1249 🔴 (+19%) 🔻30
SOstream overhead (structured)131 (-1.5%)276 🔴 (-45%) 💚659 🔴 (-23%) 💚2334 🔴 (-2.7%)30
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 155254ms → this run 147328ms (Δ -7926ms, -5%)
 50-100 ms ┃ main 0 this 1 +1
100-150 ms ██████████████████████░┃ main 667 this 734 +67
150-200 ms ███████┃█ main 276 this 230 -46
200-250 ms ┃ main 45 this 33 -12
250-300 ms ┃ main 10 this 9 -1
300-350 ms ┃ main 12 this 4 -8
350-400 ms ┃ main 5 this 6 +1
450-500 ms ┃ main 1 this 1 +0
800-850 ms ┃ main 1 this 1 +0
850-900 ms ┃ main 2 this 0 -2

📜 Previous results (3)
5ac32a8
Fri, 07 Aug 2026 22:36:47 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep273 (+5.4%)1481 🔴 (+35%) 🔻1499 🔴 (+30%) 🔻1548 🔴 (-0.6%)30
TTFSstream1327 (+637%) 🔻1409 🔴 (+35%) 🔻1423 🔴 (+32%) 🔻1558 🔴 (+30%) 🔻30
TTFShook + stream483 (+34%) 🔻1708 🔴 (+32%) 🔻1898 🔴 (+38%) 🔻5933 🔴 (+290%) 🔻30
STSO1020 steps (inline)103 (+2.0%)139 (-12%)159 (-16%) 💚255 (-25%) 💚1019
WO1020 steps138535 (-11%)138535 (-11%)138535 (-11%)138535 (-11%)1
SLstream latency104 (+16%) 🔻141 🔴 (-1.4%)337 🔴 (+56%) 🔻992 🔴 (+19%) 🔻30
SOstream overhead (text)139 (+3.0%)200 (-30%) 💚237 (-52%) 💚319 (-70%) 💚30
SOstream overhead (structured)123 (-7.5%)182 (-64%) 💚225 (-74%) 💚260 (-89%) 💚30
731c052
Fri, 07 Aug 2026 18:55:16 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep1319 (+24%) 🔻1465 🔴 (+23%) 🔻1545 🔴 (+23%) 🔻1920 🔴 (+8.2%)30
TTFSstream450 (-59%) 💚1445 🔴 (+18%) 🔻1481 🔴 (+17%) 🔻1553 🔴 (+15%)30
TTFShook + stream1423 (+4.5%)1690 🔴 (+14%)1725 🔴 (+13%)1838 🔴 (+11%)30
STSO1020 steps (inline)93 (-25%) 💚137 (-19%) 💚161 (-17%) 💚295 (-15%) 💚1019
WO1020 steps138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚138352 (-17%) 💚1
SLstream latency97 (-17%) 💚148 🔴 (-12%)161 🔴 (-23%) 💚250 🔴 (-60%) 💚30
SOstream overhead (text)121 (-18%) 💚240 (+10%)300 (+8.3%)344 (-2.3%)30
SOstream overhead (structured)123 (-22%) 💚205 (-17%) 💚286 (-31%) 💚411 (-92%) 💚30
4fcdebf
Thu, 06 Aug 2026 23:18:57 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep233 (-75%) 💚1397 🔴 (+14%)1437 🔴 (+8.0%)1825 🔴 (+11%)30
TTFSstream259 (±0%)1419 🔴 (+19%) 🔻1484 🔴 (+22%) 🔻1716 🔴 (+34%) 🔻30
TTFShook + stream363 (-12%)1645 🔴 (+8.0%)1683 🔴 (+6.7%)1748 🔴 (-15%)30
STSO1020 steps (inline)98 (-7.5%)144 (-21%) 💚170 (-20%) 💚333 (-0.9%)1019
WO1020 steps144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚144792 (-16%) 💚1
SLstream latency95 (-6.9%)133 🔴 (-28%) 💚153 🔴 (-50%) 💚871 🔴 (+54%) 🔻30
SOstream overhead (text)104 (-27%) 💚207 (-21%) 💚248 (-19%) 💚518 (+9.5%)30
SOstream overhead (structured)141 (-13%)296 🔴 (-23%) 💚383 (-26%) 💚865 (-2.1%)30
ℹ️ Metric definitions & methodology
The collapsed STSO distribution section above buckets every step gap of the sequential-steps run (not a sampled window), split by whether the step ending the gap ran inline — in the same warm process as the step before it, so the gap is pure framework overhead — or after a queue-hop — the first step of a fresh process, which pays queue dispatch, client reinit and event-log replay. Bars overlay the two runs: █ is main, ┃ marks where this run lands, ░ bridges the gap when this run has more samples in a bucket.
Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.
Metrics — TTFS: time to first step body (in-deployment start() → first step body, deployment clocks) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · SL: stream latency (in-deployment write → read propagation, readAt - writtenAt) · SO: stream overhead (end-to-end write+consume time beyond the modelled generation window)
Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · stream latency: parallel reader/writer steps on a dedicated stream; SL is the in-deployment write->read propagation (readAt - writtenAt) · stream overhead (text): writer streams 300 variable-length text token deltas paced at 100/s for 3s (a haiku-size LLM's token throughput) while a parallel reader drains the whole stream; SO is the end-to-end write+consume time beyond the 3s generation window (overhead/backpressure) · stream overhead (structured): same workload as stream overhead (text), but each delta is an AI-SDK-style structured object ({ type: 'text-delta', id, text }) instead of a raw string, so the SO gap vs the text scenario is the added serialization cost
🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · SO 250/500/1000
All metrics are measured from deployment-side timestamps only. Runs are triggered by an in-deployment route that stamps the anchor (clientStart) right before start(), so the CI runner’s request and its path through api.vercel.com sit outside every measured window. TTFS = in-deployment start() → first step body (turbo uses the in-process fast path, non-turbo the dispatch path), and includes the VQS dispatch hop plus any /flow cold start. STSO/WO are measured between step bodies on the deployment. SL is measured inside the workflow (parallel reader/writer steps), so it no longer includes the api.vercel.com read path.
Cold starts are kept in the numbers on purpose — they are part of real bursty-workload latency. The workbench deployment cold-starts the /flow invocation for a large fraction of runs, inflating P75+; the Best column shows the fastest (warm-start) sample for comparison.
vercel[bot]
vercelBot
reviewed
Aug 3, 2026
View reviewed changes
Comment threadpackages/world-vercel/src/events.ts
@NathanColosimo
Fix out-of-order run lifecycle replay
9235160
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
0ea6dc3
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e41dcb2
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
6696142
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
e05435e
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
565e9b2
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
b8d6800
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
9ea5231
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
fd88bab
…d-cursor' into codex/stream-run-started-replay-page
@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
414e4cd
…ream-run-started-replay-page
# Conflicts:
#	packages/world-vercel/src/events.ts
@NathanColosimo
Merge remote-tracking branch 'origin/codex/consume-run-started-preloa…
c712106
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@NathanColosimo
Merge branch 'codex/consume-run-started-preload-cursor' into codex/st…
b0db86b
…ream-run-started-replay-page
@NathanColosimo
Merge commit '9eafd6c638b51fc1c905a16872e091fac8f273ea' into codex/st…
9573503
…ream-run-started-replay-page
@karthikscale3karthikscale3
mentioned this pull request
Aug 5, 2026
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@VaguelySeriousVaguelySeriousVaguelySerious approved these changes
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