fix: disable dce in client mode - #632

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro0.042s (-13.4% 🟢)1.006s (~)0.964s101.00x
💻 LocalExpress0.044s (+2.3%)1.007s (~)0.963s101.06x
🐘 PostgresNitro0.313s (+23.6% 🔺)1.012s (-0.7%)0.699s107.44x
🐘 PostgresExpress0.374s (-10.6% 🟢)1.012s (~)0.638s108.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro0.553s (-26.4% 🟢)1.416s (-20.3% 🟢)0.863s101.00x
▲ VercelExpress0.677s (-12.9% 🟢)1.555s (-4.4%)0.878s101.22x

🔍 Observability: Nitro | Express

workflow with 1 step

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro1.110s (~)2.006s (~)0.896s101.00x
💻 LocalExpress1.112s (~)2.007s (~)0.895s101.00x
🐘 PostgresNitro2.168s (-0.7%)3.015s (~)0.847s101.95x
🐘 PostgresExpress2.238s (-0.6%)3.012s (~)0.774s102.02x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.568s (~)3.553s (~)0.986s101.00x
▲ VercelExpress2.613s (+1.6%)3.560s (~)0.947s101.02x

🔍 Observability: Nitro | Express

workflow with 10 sequential steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express10.779s (~)11.014s (~)0.235s51.00x
💻 LocalNitro10.787s (~)11.012s (~)0.225s51.00x
🐘 PostgresExpress17.606s (-12.7% 🟢)18.431s (-12.4% 🟢)0.825s51.63x
🐘 PostgresNitro20.376s (-0.6%)21.036s (~)0.661s51.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express21.430s (+2.6%)22.140s (+1.7%)0.710s51.00x
▲ VercelNitro21.904s (+3.5%)22.700s (+2.7%)0.796s51.02x

🔍 Observability: Express | Nitro

workflow with 10 parallel steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express1.382s (-0.7%)2.006s (~)0.624s51.00x
💻 LocalNitro1.395s (+0.5%)2.007s (~)0.612s51.01x
🐘 PostgresExpress2.324s (-11.1% 🟢)3.012s (~)0.689s51.68x
🐘 PostgresNitro2.558s (-1.0%)3.012s (~)0.454s51.85x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express3.969s (-11.5% 🟢)4.683s (-10.0% 🟢)0.714s51.00x
▲ VercelNitro4.008s (-1.4%)4.665s (~)0.657s51.01x

🔍 Observability: Express | Nitro

stress test: Promise.all with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express8.776s (-4.8%)8.934s (-6.3% 🟢)0.158s41.00x
🐘 PostgresNitro9.108s (+1.4%)9.447s (+2.3%)0.339s41.04x
💻 LocalNitro13.384s (~)13.605s (~)0.221s31.53x
💻 LocalExpress13.862s (+5.5% 🔺)13.990s (+5.2% 🔺)0.128s31.58x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.106s (-3.2%)20.514s (-5.3% 🟢)0.408s21.00x
▲ VercelNitro20.589s (-1.7%)21.527s (~)0.938s21.02x

🔍 Observability: Express | Nitro

stress test: Promise.race with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express9.308s (-4.6%)9.963s (-2.6%)0.655s41.00x
🐘 PostgresNitro9.366s (-1.0%)9.447s (-2.1%)0.081s41.01x
💻 LocalNitro14.942s (+4.3%)15.103s (+2.2%)0.161s31.61x
💻 LocalExpress15.781s (+4.1%)15.899s (+4.1%)0.118s21.70x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.784s (+5.7% 🔺)21.505s (+4.7%)0.721s21.00x
▲ VercelNitro21.259s (+9.0% 🔺)22.005s (+10.0% 🔺)0.746s21.02x

🔍 Observability: Express | Nitro

Stream Benchmarks(includes TTFB metrics)
workflow with stream

💻 Local Development

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express0.170s (~)0.992s (~)0.014s (-7.8% 🟢)1.020s (~)0.850s101.00x
💻 LocalNitro0.176s (+1.7%)0.992s (~)0.014s (-0.7%)1.020s (~)0.844s101.03x
🐘 PostgresExpress1.341s (~)1.499s (-16.5% 🟢)0.000s (NaN%)1.811s (-10.1% 🟢)0.471s107.87x
🐘 PostgresNitro2.212s (-2.0%)2.830s (+1.7%)0.000s (+Infinity% 🔺)3.014s (~)0.802s1012.98x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.692s (-1.7%)3.164s (-0.5%)0.357s (-29.6% 🟢)3.912s (-4.9%)1.220s101.00x
▲ VercelExpress2.704s (-4.1%)3.149s (-6.6% 🟢)0.562s (+7.5% 🔺)4.146s (-4.1%)1.442s101.00x

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World🥇 Fastest FrameworkWins
💻 LocalNitro4/7
🐘 PostgresExpress5/7
▲ VercelExpress4/7
Fastest World by Framework

Winner determined by most benchmark wins

Framework🥇 Fastest WorldWins
Express💻 Local5/7
Nitro💻 Local5/7
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run


Some benchmark jobs failed:

  • Local: failure
  • Postgres: failure
  • Vercel: failure

Check the workflow run for details.

⚠️Community world benchmarks failed (non-blocking):

  • Community Worlds: failure

Check the workflow run for details.

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🧪 E2E Test Results

Some tests failed

Summary

PassedFailedSkippedTotal
❌ ▲ Vercel Production258210270
✅ 💻 Local Development26208270
✅ 📦 Local Production20808216
✅ 🐘 Local Postgres20808216
✅ 🪟 Windows270027
❌ 🌍 Community Worlds109110120
Total107213341119

❌ Failed Tests

▲ Vercel Production (2 failed)

nitro (1 failed):

  • outputStreamWorkflow

sveltekit (1 failed):

  • webhookWorkflow
🌍 Community Worlds (11 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (8 failed):

  • addTenWorkflow
  • addTenWorkflow
  • retryAttemptCounterWorkflow
  • crossFileErrorWorkflow - stack traces work across imported modules
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step

turso (1 failed):

  • webhookWorkflow

Details by Category

❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro2601
✅ example2601
✅ express2601
✅ fastify2601
✅ hono2601
✅ nextjs-webpack2601
❌ nitro2511
✅ nuxt2601
❌ sveltekit2511
✅ vite2601
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nextjs-turbopack-stable2700
✅ nextjs-webpack-stable2700
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack2700
❌ 🌍 Community Worlds
AppPassedFailedSkipped
✅ mongodb-dev300
❌ mongodb2610
✅ redis-dev300
❌ redis2610
✅ starter-dev300
❌ starter1980
✅ turso-dev300
❌ turso2610

📋 View full workflow run


Some E2E test jobs failed:

  • Vercel Prod: failure
  • Local Dev: success
  • Local Prod: failure
  • Local Postgres: failure
  • Windows: success

Check the workflow run for details.

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Additional Suggestion:

The comment describing the dead code elimination behavior is outdated and contradicts the actual code behavior. It claims DCE happens in both workflow and client mode, but the modified remove_dead_code function now only runs in workflow mode.

View Details
📝 Patch Details
diff --git a/packages/swc-plugin-workflow/transform/src/lib.rs b/packages/swc-plugin-workflow/transform/src/lib.rs
index c523b2d..481eb5f 100644
--- a/packages/swc-plugin-workflow/transform/src/lib.rs+++ b/packages/swc-plugin-workflow/transform/src/lib.rs@@ -4205,7 +4205,7 @@ impl VisitMut for StepTransform {
}
}
- // Perform dead code elimination in workflow and client mode+ // Perform dead code elimination in workflow mode
self.remove_dead_code(items);
}

Analysis

Outdated comment in remove_dead_code call misleads about DCE behavior

What fails: Comment on line 4208 states "Perform dead code elimination in workflow and client mode" but the actual implementation only runs dead code elimination in workflow mode

How to verify:

  1. View the remove_dead_code() function definition at lines 2444-2446:
if !matches!(self.mode,TransformMode::Workflow){return;}
  1. This guard causes the function to exit early and skip DCE when NOT in Workflow mode (i.e., when in Client or Step mode)

Result: Comment incorrectly claims DCE runs in both workflow and client modes when it actually only runs in workflow mode

Expected: Comment should accurately describe the actual behavior: "Perform dead code elimination in workflow mode"

Fix applied: Updated line 4208 comment from "workflow and client mode" to "workflow mode" to match the code's actual behavior

Fix on Vercel

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fix: disable dce in client mode - #632

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fix/dce-client-mode
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fix: disable dce in client mode#632
adriandlam wants to merge 1 commit into
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fix/dce-client-mode

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⚠️ No Changeset found

Latest commit: 0ce756b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro0.042s (-13.4% 🟢)1.006s (~)0.964s101.00x
💻 LocalExpress0.044s (+2.3%)1.007s (~)0.963s101.06x
🐘 PostgresNitro0.313s (+23.6% 🔺)1.012s (-0.7%)0.699s107.44x
🐘 PostgresExpress0.374s (-10.6% 🟢)1.012s (~)0.638s108.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro0.553s (-26.4% 🟢)1.416s (-20.3% 🟢)0.863s101.00x
▲ VercelExpress0.677s (-12.9% 🟢)1.555s (-4.4%)0.878s101.22x

🔍 Observability: Nitro | Express

workflow with 1 step

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro1.110s (~)2.006s (~)0.896s101.00x
💻 LocalExpress1.112s (~)2.007s (~)0.895s101.00x
🐘 PostgresNitro2.168s (-0.7%)3.015s (~)0.847s101.95x
🐘 PostgresExpress2.238s (-0.6%)3.012s (~)0.774s102.02x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.568s (~)3.553s (~)0.986s101.00x
▲ VercelExpress2.613s (+1.6%)3.560s (~)0.947s101.02x

🔍 Observability: Nitro | Express

workflow with 10 sequential steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express10.779s (~)11.014s (~)0.235s51.00x
💻 LocalNitro10.787s (~)11.012s (~)0.225s51.00x
🐘 PostgresExpress17.606s (-12.7% 🟢)18.431s (-12.4% 🟢)0.825s51.63x
🐘 PostgresNitro20.376s (-0.6%)21.036s (~)0.661s51.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express21.430s (+2.6%)22.140s (+1.7%)0.710s51.00x
▲ VercelNitro21.904s (+3.5%)22.700s (+2.7%)0.796s51.02x

🔍 Observability: Express | Nitro

workflow with 10 parallel steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express1.382s (-0.7%)2.006s (~)0.624s51.00x
💻 LocalNitro1.395s (+0.5%)2.007s (~)0.612s51.01x
🐘 PostgresExpress2.324s (-11.1% 🟢)3.012s (~)0.689s51.68x
🐘 PostgresNitro2.558s (-1.0%)3.012s (~)0.454s51.85x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express3.969s (-11.5% 🟢)4.683s (-10.0% 🟢)0.714s51.00x
▲ VercelNitro4.008s (-1.4%)4.665s (~)0.657s51.01x

🔍 Observability: Express | Nitro

stress test: Promise.all with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express8.776s (-4.8%)8.934s (-6.3% 🟢)0.158s41.00x
🐘 PostgresNitro9.108s (+1.4%)9.447s (+2.3%)0.339s41.04x
💻 LocalNitro13.384s (~)13.605s (~)0.221s31.53x
💻 LocalExpress13.862s (+5.5% 🔺)13.990s (+5.2% 🔺)0.128s31.58x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.106s (-3.2%)20.514s (-5.3% 🟢)0.408s21.00x
▲ VercelNitro20.589s (-1.7%)21.527s (~)0.938s21.02x

🔍 Observability: Express | Nitro

stress test: Promise.race with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express9.308s (-4.6%)9.963s (-2.6%)0.655s41.00x
🐘 PostgresNitro9.366s (-1.0%)9.447s (-2.1%)0.081s41.01x
💻 LocalNitro14.942s (+4.3%)15.103s (+2.2%)0.161s31.61x
💻 LocalExpress15.781s (+4.1%)15.899s (+4.1%)0.118s21.70x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.784s (+5.7% 🔺)21.505s (+4.7%)0.721s21.00x
▲ VercelNitro21.259s (+9.0% 🔺)22.005s (+10.0% 🔺)0.746s21.02x

🔍 Observability: Express | Nitro

Stream Benchmarks(includes TTFB metrics)
workflow with stream

💻 Local Development

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express0.170s (~)0.992s (~)0.014s (-7.8% 🟢)1.020s (~)0.850s101.00x
💻 LocalNitro0.176s (+1.7%)0.992s (~)0.014s (-0.7%)1.020s (~)0.844s101.03x
🐘 PostgresExpress1.341s (~)1.499s (-16.5% 🟢)0.000s (NaN%)1.811s (-10.1% 🟢)0.471s107.87x
🐘 PostgresNitro2.212s (-2.0%)2.830s (+1.7%)0.000s (+Infinity% 🔺)3.014s (~)0.802s1012.98x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.692s (-1.7%)3.164s (-0.5%)0.357s (-29.6% 🟢)3.912s (-4.9%)1.220s101.00x
▲ VercelExpress2.704s (-4.1%)3.149s (-6.6% 🟢)0.562s (+7.5% 🔺)4.146s (-4.1%)1.442s101.00x

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World🥇 Fastest FrameworkWins
💻 LocalNitro4/7
🐘 PostgresExpress5/7
▲ VercelExpress4/7
Fastest World by Framework

Winner determined by most benchmark wins

Framework🥇 Fastest WorldWins
Express💻 Local5/7
Nitro💻 Local5/7
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run


Some benchmark jobs failed:

  • Local: failure
  • Postgres: failure
  • Vercel: failure

Check the workflow run for details.

⚠️Community world benchmarks failed (non-blocking):

  • Community Worlds: failure

Check the workflow run for details.

@github-actions

github-actionsBot commented Dec 16, 2025

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🧪 E2E Test Results

Some tests failed

Summary

PassedFailedSkippedTotal
❌ ▲ Vercel Production258210270
✅ 💻 Local Development26208270
✅ 📦 Local Production20808216
✅ 🐘 Local Postgres20808216
✅ 🪟 Windows270027
❌ 🌍 Community Worlds109110120
Total107213341119

❌ Failed Tests

▲ Vercel Production (2 failed)

nitro (1 failed):

  • outputStreamWorkflow

sveltekit (1 failed):

  • webhookWorkflow
🌍 Community Worlds (11 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (8 failed):

  • addTenWorkflow
  • addTenWorkflow
  • retryAttemptCounterWorkflow
  • crossFileErrorWorkflow - stack traces work across imported modules
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step

turso (1 failed):

  • webhookWorkflow

Details by Category

❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro2601
✅ example2601
✅ express2601
✅ fastify2601
✅ hono2601
✅ nextjs-webpack2601
❌ nitro2511
✅ nuxt2601
❌ sveltekit2511
✅ vite2601
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nextjs-turbopack-stable2700
✅ nextjs-webpack-stable2700
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack2700
❌ 🌍 Community Worlds
AppPassedFailedSkipped
✅ mongodb-dev300
❌ mongodb2610
✅ redis-dev300
❌ redis2610
✅ starter-dev300
❌ starter1980
✅ turso-dev300
❌ turso2610

📋 View full workflow run


Some E2E test jobs failed:

  • Vercel Prod: failure
  • Local Dev: success
  • Local Prod: failure
  • Local Postgres: failure
  • Windows: success

Check the workflow run for details.

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Additional Suggestion:

The comment describing the dead code elimination behavior is outdated and contradicts the actual code behavior. It claims DCE happens in both workflow and client mode, but the modified remove_dead_code function now only runs in workflow mode.

View Details
📝 Patch Details
diff --git a/packages/swc-plugin-workflow/transform/src/lib.rs b/packages/swc-plugin-workflow/transform/src/lib.rs
index c523b2d..481eb5f 100644
--- a/packages/swc-plugin-workflow/transform/src/lib.rs+++ b/packages/swc-plugin-workflow/transform/src/lib.rs@@ -4205,7 +4205,7 @@ impl VisitMut for StepTransform {
}
}
- // Perform dead code elimination in workflow and client mode+ // Perform dead code elimination in workflow mode
self.remove_dead_code(items);
}

Analysis

Outdated comment in remove_dead_code call misleads about DCE behavior

What fails: Comment on line 4208 states "Perform dead code elimination in workflow and client mode" but the actual implementation only runs dead code elimination in workflow mode

How to verify:

  1. View the remove_dead_code() function definition at lines 2444-2446:
if !matches!(self.mode,TransformMode::Workflow){return;}
  1. This guard causes the function to exit early and skip DCE when NOT in Workflow mode (i.e., when in Client or Step mode)

Result: Comment incorrectly claims DCE runs in both workflow and client modes when it actually only runs in workflow mode

Expected: Comment should accurately describe the actual behavior: "Perform dead code elimination in workflow mode"

Fix applied: Updated line 4208 comment from "workflow and client mode" to "workflow mode" to match the code's actual behavior

Fix on Vercel

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fix: disable dce in client mode - #632

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⚠️ No Changeset found

Latest commit: 0ce756b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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The latest updates on your projects. Learn more about Vercel for GitHub.

ProjectDeploymentReviewUpdated (UTC)
example-nextjs-workflow-turbopackErrorErrorDec 16, 2025 10:06pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentDec 16, 2025 10:06pm
example-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-astro-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-express-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
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workbench-nuxt-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-sveltekit-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
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workflow-docsReadyReadyPreview, CommentDec 16, 2025 10:06pm

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro0.042s (-13.4% 🟢)1.006s (~)0.964s101.00x
💻 LocalExpress0.044s (+2.3%)1.007s (~)0.963s101.06x
🐘 PostgresNitro0.313s (+23.6% 🔺)1.012s (-0.7%)0.699s107.44x
🐘 PostgresExpress0.374s (-10.6% 🟢)1.012s (~)0.638s108.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro0.553s (-26.4% 🟢)1.416s (-20.3% 🟢)0.863s101.00x
▲ VercelExpress0.677s (-12.9% 🟢)1.555s (-4.4%)0.878s101.22x

🔍 Observability: Nitro | Express

workflow with 1 step

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro1.110s (~)2.006s (~)0.896s101.00x
💻 LocalExpress1.112s (~)2.007s (~)0.895s101.00x
🐘 PostgresNitro2.168s (-0.7%)3.015s (~)0.847s101.95x
🐘 PostgresExpress2.238s (-0.6%)3.012s (~)0.774s102.02x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.568s (~)3.553s (~)0.986s101.00x
▲ VercelExpress2.613s (+1.6%)3.560s (~)0.947s101.02x

🔍 Observability: Nitro | Express

workflow with 10 sequential steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express10.779s (~)11.014s (~)0.235s51.00x
💻 LocalNitro10.787s (~)11.012s (~)0.225s51.00x
🐘 PostgresExpress17.606s (-12.7% 🟢)18.431s (-12.4% 🟢)0.825s51.63x
🐘 PostgresNitro20.376s (-0.6%)21.036s (~)0.661s51.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express21.430s (+2.6%)22.140s (+1.7%)0.710s51.00x
▲ VercelNitro21.904s (+3.5%)22.700s (+2.7%)0.796s51.02x

🔍 Observability: Express | Nitro

workflow with 10 parallel steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express1.382s (-0.7%)2.006s (~)0.624s51.00x
💻 LocalNitro1.395s (+0.5%)2.007s (~)0.612s51.01x
🐘 PostgresExpress2.324s (-11.1% 🟢)3.012s (~)0.689s51.68x
🐘 PostgresNitro2.558s (-1.0%)3.012s (~)0.454s51.85x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express3.969s (-11.5% 🟢)4.683s (-10.0% 🟢)0.714s51.00x
▲ VercelNitro4.008s (-1.4%)4.665s (~)0.657s51.01x

🔍 Observability: Express | Nitro

stress test: Promise.all with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express8.776s (-4.8%)8.934s (-6.3% 🟢)0.158s41.00x
🐘 PostgresNitro9.108s (+1.4%)9.447s (+2.3%)0.339s41.04x
💻 LocalNitro13.384s (~)13.605s (~)0.221s31.53x
💻 LocalExpress13.862s (+5.5% 🔺)13.990s (+5.2% 🔺)0.128s31.58x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.106s (-3.2%)20.514s (-5.3% 🟢)0.408s21.00x
▲ VercelNitro20.589s (-1.7%)21.527s (~)0.938s21.02x

🔍 Observability: Express | Nitro

stress test: Promise.race with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express9.308s (-4.6%)9.963s (-2.6%)0.655s41.00x
🐘 PostgresNitro9.366s (-1.0%)9.447s (-2.1%)0.081s41.01x
💻 LocalNitro14.942s (+4.3%)15.103s (+2.2%)0.161s31.61x
💻 LocalExpress15.781s (+4.1%)15.899s (+4.1%)0.118s21.70x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.784s (+5.7% 🔺)21.505s (+4.7%)0.721s21.00x
▲ VercelNitro21.259s (+9.0% 🔺)22.005s (+10.0% 🔺)0.746s21.02x

🔍 Observability: Express | Nitro

Stream Benchmarks(includes TTFB metrics)
workflow with stream

💻 Local Development

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express0.170s (~)0.992s (~)0.014s (-7.8% 🟢)1.020s (~)0.850s101.00x
💻 LocalNitro0.176s (+1.7%)0.992s (~)0.014s (-0.7%)1.020s (~)0.844s101.03x
🐘 PostgresExpress1.341s (~)1.499s (-16.5% 🟢)0.000s (NaN%)1.811s (-10.1% 🟢)0.471s107.87x
🐘 PostgresNitro2.212s (-2.0%)2.830s (+1.7%)0.000s (+Infinity% 🔺)3.014s (~)0.802s1012.98x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.692s (-1.7%)3.164s (-0.5%)0.357s (-29.6% 🟢)3.912s (-4.9%)1.220s101.00x
▲ VercelExpress2.704s (-4.1%)3.149s (-6.6% 🟢)0.562s (+7.5% 🔺)4.146s (-4.1%)1.442s101.00x

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World🥇 Fastest FrameworkWins
💻 LocalNitro4/7
🐘 PostgresExpress5/7
▲ VercelExpress4/7
Fastest World by Framework

Winner determined by most benchmark wins

Framework🥇 Fastest WorldWins
Express💻 Local5/7
Nitro💻 Local5/7
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run


Some benchmark jobs failed:

  • Local: failure
  • Postgres: failure
  • Vercel: failure

Check the workflow run for details.

⚠️Community world benchmarks failed (non-blocking):

  • Community Worlds: failure

Check the workflow run for details.

@github-actions

github-actionsBot commented Dec 16, 2025

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🧪 E2E Test Results

Some tests failed

Summary

PassedFailedSkippedTotal
❌ ▲ Vercel Production258210270
✅ 💻 Local Development26208270
✅ 📦 Local Production20808216
✅ 🐘 Local Postgres20808216
✅ 🪟 Windows270027
❌ 🌍 Community Worlds109110120
Total107213341119

❌ Failed Tests

▲ Vercel Production (2 failed)

nitro (1 failed):

  • outputStreamWorkflow

sveltekit (1 failed):

  • webhookWorkflow
🌍 Community Worlds (11 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (8 failed):

  • addTenWorkflow
  • addTenWorkflow
  • retryAttemptCounterWorkflow
  • crossFileErrorWorkflow - stack traces work across imported modules
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step

turso (1 failed):

  • webhookWorkflow

Details by Category

❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro2601
✅ example2601
✅ express2601
✅ fastify2601
✅ hono2601
✅ nextjs-webpack2601
❌ nitro2511
✅ nuxt2601
❌ sveltekit2511
✅ vite2601
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nextjs-turbopack-stable2700
✅ nextjs-webpack-stable2700
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack2700
❌ 🌍 Community Worlds
AppPassedFailedSkipped
✅ mongodb-dev300
❌ mongodb2610
✅ redis-dev300
❌ redis2610
✅ starter-dev300
❌ starter1980
✅ turso-dev300
❌ turso2610

📋 View full workflow run


Some E2E test jobs failed:

  • Vercel Prod: failure
  • Local Dev: success
  • Local Prod: failure
  • Local Postgres: failure
  • Windows: success

Check the workflow run for details.

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Additional Suggestion:

The comment describing the dead code elimination behavior is outdated and contradicts the actual code behavior. It claims DCE happens in both workflow and client mode, but the modified remove_dead_code function now only runs in workflow mode.

View Details
📝 Patch Details
diff --git a/packages/swc-plugin-workflow/transform/src/lib.rs b/packages/swc-plugin-workflow/transform/src/lib.rs
index c523b2d..481eb5f 100644
--- a/packages/swc-plugin-workflow/transform/src/lib.rs+++ b/packages/swc-plugin-workflow/transform/src/lib.rs@@ -4205,7 +4205,7 @@ impl VisitMut for StepTransform {
}
}
- // Perform dead code elimination in workflow and client mode+ // Perform dead code elimination in workflow mode
self.remove_dead_code(items);
}

Analysis

Outdated comment in remove_dead_code call misleads about DCE behavior

What fails: Comment on line 4208 states "Perform dead code elimination in workflow and client mode" but the actual implementation only runs dead code elimination in workflow mode

How to verify:

  1. View the remove_dead_code() function definition at lines 2444-2446:
if !matches!(self.mode,TransformMode::Workflow){return;}
  1. This guard causes the function to exit early and skip DCE when NOT in Workflow mode (i.e., when in Client or Step mode)

Result: Comment incorrectly claims DCE runs in both workflow and client modes when it actually only runs in workflow mode

Expected: Comment should accurately describe the actual behavior: "Perform dead code elimination in workflow mode"

Fix applied: Updated line 4208 comment from "workflow and client mode" to "workflow mode" to match the code's actual behavior

Fix on Vercel

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fix: disable dce in client mode - #632

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fix/dce-client-mode
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fix: disable dce in client mode#632
adriandlam wants to merge 1 commit into
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fix/dce-client-mode

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⚠️ No Changeset found

Latest commit: 0ce756b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro0.042s (-13.4% 🟢)1.006s (~)0.964s101.00x
💻 LocalExpress0.044s (+2.3%)1.007s (~)0.963s101.06x
🐘 PostgresNitro0.313s (+23.6% 🔺)1.012s (-0.7%)0.699s107.44x
🐘 PostgresExpress0.374s (-10.6% 🟢)1.012s (~)0.638s108.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro0.553s (-26.4% 🟢)1.416s (-20.3% 🟢)0.863s101.00x
▲ VercelExpress0.677s (-12.9% 🟢)1.555s (-4.4%)0.878s101.22x

🔍 Observability: Nitro | Express

workflow with 1 step

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro1.110s (~)2.006s (~)0.896s101.00x
💻 LocalExpress1.112s (~)2.007s (~)0.895s101.00x
🐘 PostgresNitro2.168s (-0.7%)3.015s (~)0.847s101.95x
🐘 PostgresExpress2.238s (-0.6%)3.012s (~)0.774s102.02x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.568s (~)3.553s (~)0.986s101.00x
▲ VercelExpress2.613s (+1.6%)3.560s (~)0.947s101.02x

🔍 Observability: Nitro | Express

workflow with 10 sequential steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express10.779s (~)11.014s (~)0.235s51.00x
💻 LocalNitro10.787s (~)11.012s (~)0.225s51.00x
🐘 PostgresExpress17.606s (-12.7% 🟢)18.431s (-12.4% 🟢)0.825s51.63x
🐘 PostgresNitro20.376s (-0.6%)21.036s (~)0.661s51.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express21.430s (+2.6%)22.140s (+1.7%)0.710s51.00x
▲ VercelNitro21.904s (+3.5%)22.700s (+2.7%)0.796s51.02x

🔍 Observability: Express | Nitro

workflow with 10 parallel steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express1.382s (-0.7%)2.006s (~)0.624s51.00x
💻 LocalNitro1.395s (+0.5%)2.007s (~)0.612s51.01x
🐘 PostgresExpress2.324s (-11.1% 🟢)3.012s (~)0.689s51.68x
🐘 PostgresNitro2.558s (-1.0%)3.012s (~)0.454s51.85x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express3.969s (-11.5% 🟢)4.683s (-10.0% 🟢)0.714s51.00x
▲ VercelNitro4.008s (-1.4%)4.665s (~)0.657s51.01x

🔍 Observability: Express | Nitro

stress test: Promise.all with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express8.776s (-4.8%)8.934s (-6.3% 🟢)0.158s41.00x
🐘 PostgresNitro9.108s (+1.4%)9.447s (+2.3%)0.339s41.04x
💻 LocalNitro13.384s (~)13.605s (~)0.221s31.53x
💻 LocalExpress13.862s (+5.5% 🔺)13.990s (+5.2% 🔺)0.128s31.58x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.106s (-3.2%)20.514s (-5.3% 🟢)0.408s21.00x
▲ VercelNitro20.589s (-1.7%)21.527s (~)0.938s21.02x

🔍 Observability: Express | Nitro

stress test: Promise.race with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express9.308s (-4.6%)9.963s (-2.6%)0.655s41.00x
🐘 PostgresNitro9.366s (-1.0%)9.447s (-2.1%)0.081s41.01x
💻 LocalNitro14.942s (+4.3%)15.103s (+2.2%)0.161s31.61x
💻 LocalExpress15.781s (+4.1%)15.899s (+4.1%)0.118s21.70x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.784s (+5.7% 🔺)21.505s (+4.7%)0.721s21.00x
▲ VercelNitro21.259s (+9.0% 🔺)22.005s (+10.0% 🔺)0.746s21.02x

🔍 Observability: Express | Nitro

Stream Benchmarks(includes TTFB metrics)
workflow with stream

💻 Local Development

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express0.170s (~)0.992s (~)0.014s (-7.8% 🟢)1.020s (~)0.850s101.00x
💻 LocalNitro0.176s (+1.7%)0.992s (~)0.014s (-0.7%)1.020s (~)0.844s101.03x
🐘 PostgresExpress1.341s (~)1.499s (-16.5% 🟢)0.000s (NaN%)1.811s (-10.1% 🟢)0.471s107.87x
🐘 PostgresNitro2.212s (-2.0%)2.830s (+1.7%)0.000s (+Infinity% 🔺)3.014s (~)0.802s1012.98x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.692s (-1.7%)3.164s (-0.5%)0.357s (-29.6% 🟢)3.912s (-4.9%)1.220s101.00x
▲ VercelExpress2.704s (-4.1%)3.149s (-6.6% 🟢)0.562s (+7.5% 🔺)4.146s (-4.1%)1.442s101.00x

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World🥇 Fastest FrameworkWins
💻 LocalNitro4/7
🐘 PostgresExpress5/7
▲ VercelExpress4/7
Fastest World by Framework

Winner determined by most benchmark wins

Framework🥇 Fastest WorldWins
Express💻 Local5/7
Nitro💻 Local5/7
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run


Some benchmark jobs failed:

  • Local: failure
  • Postgres: failure
  • Vercel: failure

Check the workflow run for details.

⚠️Community world benchmarks failed (non-blocking):

  • Community Worlds: failure

Check the workflow run for details.

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🧪 E2E Test Results

Some tests failed

Summary

PassedFailedSkippedTotal
❌ ▲ Vercel Production258210270
✅ 💻 Local Development26208270
✅ 📦 Local Production20808216
✅ 🐘 Local Postgres20808216
✅ 🪟 Windows270027
❌ 🌍 Community Worlds109110120
Total107213341119

❌ Failed Tests

▲ Vercel Production (2 failed)

nitro (1 failed):

  • outputStreamWorkflow

sveltekit (1 failed):

  • webhookWorkflow
🌍 Community Worlds (11 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (8 failed):

  • addTenWorkflow
  • addTenWorkflow
  • retryAttemptCounterWorkflow
  • crossFileErrorWorkflow - stack traces work across imported modules
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step

turso (1 failed):

  • webhookWorkflow

Details by Category

❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro2601
✅ example2601
✅ express2601
✅ fastify2601
✅ hono2601
✅ nextjs-webpack2601
❌ nitro2511
✅ nuxt2601
❌ sveltekit2511
✅ vite2601
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nextjs-turbopack-stable2700
✅ nextjs-webpack-stable2700
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack2700
❌ 🌍 Community Worlds
AppPassedFailedSkipped
✅ mongodb-dev300
❌ mongodb2610
✅ redis-dev300
❌ redis2610
✅ starter-dev300
❌ starter1980
✅ turso-dev300
❌ turso2610

📋 View full workflow run


Some E2E test jobs failed:

  • Vercel Prod: failure
  • Local Dev: success
  • Local Prod: failure
  • Local Postgres: failure
  • Windows: success

Check the workflow run for details.

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Additional Suggestion:

The comment describing the dead code elimination behavior is outdated and contradicts the actual code behavior. It claims DCE happens in both workflow and client mode, but the modified remove_dead_code function now only runs in workflow mode.

View Details
📝 Patch Details
diff --git a/packages/swc-plugin-workflow/transform/src/lib.rs b/packages/swc-plugin-workflow/transform/src/lib.rs
index c523b2d..481eb5f 100644
--- a/packages/swc-plugin-workflow/transform/src/lib.rs+++ b/packages/swc-plugin-workflow/transform/src/lib.rs@@ -4205,7 +4205,7 @@ impl VisitMut for StepTransform {
}
}
- // Perform dead code elimination in workflow and client mode+ // Perform dead code elimination in workflow mode
self.remove_dead_code(items);
}

Analysis

Outdated comment in remove_dead_code call misleads about DCE behavior

What fails: Comment on line 4208 states "Perform dead code elimination in workflow and client mode" but the actual implementation only runs dead code elimination in workflow mode

How to verify:

  1. View the remove_dead_code() function definition at lines 2444-2446:
if !matches!(self.mode,TransformMode::Workflow){return;}
  1. This guard causes the function to exit early and skip DCE when NOT in Workflow mode (i.e., when in Client or Step mode)

Result: Comment incorrectly claims DCE runs in both workflow and client modes when it actually only runs in workflow mode

Expected: Comment should accurately describe the actual behavior: "Perform dead code elimination in workflow mode"

Fix applied: Updated line 4208 comment from "workflow and client mode" to "workflow mode" to match the code's actual behavior

Fix on Vercel

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@adriandlam
, '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" + '
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fix: disable dce in client mode - #632

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro0.042s (-13.4% 🟢)1.006s (~)0.964s101.00x
💻 LocalExpress0.044s (+2.3%)1.007s (~)0.963s101.06x
🐘 PostgresNitro0.313s (+23.6% 🔺)1.012s (-0.7%)0.699s107.44x
🐘 PostgresExpress0.374s (-10.6% 🟢)1.012s (~)0.638s108.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro0.553s (-26.4% 🟢)1.416s (-20.3% 🟢)0.863s101.00x
▲ VercelExpress0.677s (-12.9% 🟢)1.555s (-4.4%)0.878s101.22x

🔍 Observability: Nitro | Express

workflow with 1 step

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro1.110s (~)2.006s (~)0.896s101.00x
💻 LocalExpress1.112s (~)2.007s (~)0.895s101.00x
🐘 PostgresNitro2.168s (-0.7%)3.015s (~)0.847s101.95x
🐘 PostgresExpress2.238s (-0.6%)3.012s (~)0.774s102.02x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.568s (~)3.553s (~)0.986s101.00x
▲ VercelExpress2.613s (+1.6%)3.560s (~)0.947s101.02x

🔍 Observability: Nitro | Express

workflow with 10 sequential steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express10.779s (~)11.014s (~)0.235s51.00x
💻 LocalNitro10.787s (~)11.012s (~)0.225s51.00x
🐘 PostgresExpress17.606s (-12.7% 🟢)18.431s (-12.4% 🟢)0.825s51.63x
🐘 PostgresNitro20.376s (-0.6%)21.036s (~)0.661s51.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express21.430s (+2.6%)22.140s (+1.7%)0.710s51.00x
▲ VercelNitro21.904s (+3.5%)22.700s (+2.7%)0.796s51.02x

🔍 Observability: Express | Nitro

workflow with 10 parallel steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express1.382s (-0.7%)2.006s (~)0.624s51.00x
💻 LocalNitro1.395s (+0.5%)2.007s (~)0.612s51.01x
🐘 PostgresExpress2.324s (-11.1% 🟢)3.012s (~)0.689s51.68x
🐘 PostgresNitro2.558s (-1.0%)3.012s (~)0.454s51.85x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express3.969s (-11.5% 🟢)4.683s (-10.0% 🟢)0.714s51.00x
▲ VercelNitro4.008s (-1.4%)4.665s (~)0.657s51.01x

🔍 Observability: Express | Nitro

stress test: Promise.all with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express8.776s (-4.8%)8.934s (-6.3% 🟢)0.158s41.00x
🐘 PostgresNitro9.108s (+1.4%)9.447s (+2.3%)0.339s41.04x
💻 LocalNitro13.384s (~)13.605s (~)0.221s31.53x
💻 LocalExpress13.862s (+5.5% 🔺)13.990s (+5.2% 🔺)0.128s31.58x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.106s (-3.2%)20.514s (-5.3% 🟢)0.408s21.00x
▲ VercelNitro20.589s (-1.7%)21.527s (~)0.938s21.02x

🔍 Observability: Express | Nitro

stress test: Promise.race with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express9.308s (-4.6%)9.963s (-2.6%)0.655s41.00x
🐘 PostgresNitro9.366s (-1.0%)9.447s (-2.1%)0.081s41.01x
💻 LocalNitro14.942s (+4.3%)15.103s (+2.2%)0.161s31.61x
💻 LocalExpress15.781s (+4.1%)15.899s (+4.1%)0.118s21.70x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.784s (+5.7% 🔺)21.505s (+4.7%)0.721s21.00x
▲ VercelNitro21.259s (+9.0% 🔺)22.005s (+10.0% 🔺)0.746s21.02x

🔍 Observability: Express | Nitro

Stream Benchmarks(includes TTFB metrics)
workflow with stream

💻 Local Development

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express0.170s (~)0.992s (~)0.014s (-7.8% 🟢)1.020s (~)0.850s101.00x
💻 LocalNitro0.176s (+1.7%)0.992s (~)0.014s (-0.7%)1.020s (~)0.844s101.03x
🐘 PostgresExpress1.341s (~)1.499s (-16.5% 🟢)0.000s (NaN%)1.811s (-10.1% 🟢)0.471s107.87x
🐘 PostgresNitro2.212s (-2.0%)2.830s (+1.7%)0.000s (+Infinity% 🔺)3.014s (~)0.802s1012.98x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.692s (-1.7%)3.164s (-0.5%)0.357s (-29.6% 🟢)3.912s (-4.9%)1.220s101.00x
▲ VercelExpress2.704s (-4.1%)3.149s (-6.6% 🟢)0.562s (+7.5% 🔺)4.146s (-4.1%)1.442s101.00x

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World🥇 Fastest FrameworkWins
💻 LocalNitro4/7
🐘 PostgresExpress5/7
▲ VercelExpress4/7
Fastest World by Framework

Winner determined by most benchmark wins

Framework🥇 Fastest WorldWins
Express💻 Local5/7
Nitro💻 Local5/7
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run


Some benchmark jobs failed:

  • Local: failure
  • Postgres: failure
  • Vercel: failure

Check the workflow run for details.

⚠️Community world benchmarks failed (non-blocking):

  • Community Worlds: failure

Check the workflow run for details.

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🧪 E2E Test Results

Some tests failed

Summary

PassedFailedSkippedTotal
❌ ▲ Vercel Production258210270
✅ 💻 Local Development26208270
✅ 📦 Local Production20808216
✅ 🐘 Local Postgres20808216
✅ 🪟 Windows270027
❌ 🌍 Community Worlds109110120
Total107213341119

❌ Failed Tests

▲ Vercel Production (2 failed)

nitro (1 failed):

  • outputStreamWorkflow

sveltekit (1 failed):

  • webhookWorkflow
🌍 Community Worlds (11 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (8 failed):

  • addTenWorkflow
  • addTenWorkflow
  • retryAttemptCounterWorkflow
  • crossFileErrorWorkflow - stack traces work across imported modules
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step

turso (1 failed):

  • webhookWorkflow

Details by Category

❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro2601
✅ example2601
✅ express2601
✅ fastify2601
✅ hono2601
✅ nextjs-webpack2601
❌ nitro2511
✅ nuxt2601
❌ sveltekit2511
✅ vite2601
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nextjs-turbopack-stable2700
✅ nextjs-webpack-stable2700
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack2700
❌ 🌍 Community Worlds
AppPassedFailedSkipped
✅ mongodb-dev300
❌ mongodb2610
✅ redis-dev300
❌ redis2610
✅ starter-dev300
❌ starter1980
✅ turso-dev300
❌ turso2610

📋 View full workflow run


Some E2E test jobs failed:

  • Vercel Prod: failure
  • Local Dev: success
  • Local Prod: failure
  • Local Postgres: failure
  • Windows: success

Check the workflow run for details.

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Additional Suggestion:

The comment describing the dead code elimination behavior is outdated and contradicts the actual code behavior. It claims DCE happens in both workflow and client mode, but the modified remove_dead_code function now only runs in workflow mode.

View Details
📝 Patch Details
diff --git a/packages/swc-plugin-workflow/transform/src/lib.rs b/packages/swc-plugin-workflow/transform/src/lib.rs
index c523b2d..481eb5f 100644
--- a/packages/swc-plugin-workflow/transform/src/lib.rs+++ b/packages/swc-plugin-workflow/transform/src/lib.rs@@ -4205,7 +4205,7 @@ impl VisitMut for StepTransform {
}
}
- // Perform dead code elimination in workflow and client mode+ // Perform dead code elimination in workflow mode
self.remove_dead_code(items);
}

Analysis

Outdated comment in remove_dead_code call misleads about DCE behavior

What fails: Comment on line 4208 states "Perform dead code elimination in workflow and client mode" but the actual implementation only runs dead code elimination in workflow mode

How to verify:

  1. View the remove_dead_code() function definition at lines 2444-2446:
if !matches!(self.mode,TransformMode::Workflow){return;}
  1. This guard causes the function to exit early and skip DCE when NOT in Workflow mode (i.e., when in Client or Step mode)

Result: Comment incorrectly claims DCE runs in both workflow and client modes when it actually only runs in workflow mode

Expected: Comment should accurately describe the actual behavior: "Perform dead code elimination in workflow mode"

Fix applied: Updated line 4208 comment from "workflow and client mode" to "workflow mode" to match the code's actual behavior

Fix on Vercel

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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fix: disable dce in client mode - #632

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⚠️ No Changeset found

Latest commit: 0ce756b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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The latest updates on your projects. Learn more about Vercel for GitHub.

ProjectDeploymentReviewUpdated (UTC)
example-nextjs-workflow-turbopackErrorErrorDec 16, 2025 10:06pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentDec 16, 2025 10:06pm
example-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-astro-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-express-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-fastify-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-hono-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-nitro-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-nuxt-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-sveltekit-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
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workflow-docsReadyReadyPreview, CommentDec 16, 2025 10:06pm

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro0.042s (-13.4% 🟢)1.006s (~)0.964s101.00x
💻 LocalExpress0.044s (+2.3%)1.007s (~)0.963s101.06x
🐘 PostgresNitro0.313s (+23.6% 🔺)1.012s (-0.7%)0.699s107.44x
🐘 PostgresExpress0.374s (-10.6% 🟢)1.012s (~)0.638s108.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro0.553s (-26.4% 🟢)1.416s (-20.3% 🟢)0.863s101.00x
▲ VercelExpress0.677s (-12.9% 🟢)1.555s (-4.4%)0.878s101.22x

🔍 Observability: Nitro | Express

workflow with 1 step

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro1.110s (~)2.006s (~)0.896s101.00x
💻 LocalExpress1.112s (~)2.007s (~)0.895s101.00x
🐘 PostgresNitro2.168s (-0.7%)3.015s (~)0.847s101.95x
🐘 PostgresExpress2.238s (-0.6%)3.012s (~)0.774s102.02x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.568s (~)3.553s (~)0.986s101.00x
▲ VercelExpress2.613s (+1.6%)3.560s (~)0.947s101.02x

🔍 Observability: Nitro | Express

workflow with 10 sequential steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express10.779s (~)11.014s (~)0.235s51.00x
💻 LocalNitro10.787s (~)11.012s (~)0.225s51.00x
🐘 PostgresExpress17.606s (-12.7% 🟢)18.431s (-12.4% 🟢)0.825s51.63x
🐘 PostgresNitro20.376s (-0.6%)21.036s (~)0.661s51.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express21.430s (+2.6%)22.140s (+1.7%)0.710s51.00x
▲ VercelNitro21.904s (+3.5%)22.700s (+2.7%)0.796s51.02x

🔍 Observability: Express | Nitro

workflow with 10 parallel steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express1.382s (-0.7%)2.006s (~)0.624s51.00x
💻 LocalNitro1.395s (+0.5%)2.007s (~)0.612s51.01x
🐘 PostgresExpress2.324s (-11.1% 🟢)3.012s (~)0.689s51.68x
🐘 PostgresNitro2.558s (-1.0%)3.012s (~)0.454s51.85x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express3.969s (-11.5% 🟢)4.683s (-10.0% 🟢)0.714s51.00x
▲ VercelNitro4.008s (-1.4%)4.665s (~)0.657s51.01x

🔍 Observability: Express | Nitro

stress test: Promise.all with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express8.776s (-4.8%)8.934s (-6.3% 🟢)0.158s41.00x
🐘 PostgresNitro9.108s (+1.4%)9.447s (+2.3%)0.339s41.04x
💻 LocalNitro13.384s (~)13.605s (~)0.221s31.53x
💻 LocalExpress13.862s (+5.5% 🔺)13.990s (+5.2% 🔺)0.128s31.58x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.106s (-3.2%)20.514s (-5.3% 🟢)0.408s21.00x
▲ VercelNitro20.589s (-1.7%)21.527s (~)0.938s21.02x

🔍 Observability: Express | Nitro

stress test: Promise.race with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express9.308s (-4.6%)9.963s (-2.6%)0.655s41.00x
🐘 PostgresNitro9.366s (-1.0%)9.447s (-2.1%)0.081s41.01x
💻 LocalNitro14.942s (+4.3%)15.103s (+2.2%)0.161s31.61x
💻 LocalExpress15.781s (+4.1%)15.899s (+4.1%)0.118s21.70x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.784s (+5.7% 🔺)21.505s (+4.7%)0.721s21.00x
▲ VercelNitro21.259s (+9.0% 🔺)22.005s (+10.0% 🔺)0.746s21.02x

🔍 Observability: Express | Nitro

Stream Benchmarks(includes TTFB metrics)
workflow with stream

💻 Local Development

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express0.170s (~)0.992s (~)0.014s (-7.8% 🟢)1.020s (~)0.850s101.00x
💻 LocalNitro0.176s (+1.7%)0.992s (~)0.014s (-0.7%)1.020s (~)0.844s101.03x
🐘 PostgresExpress1.341s (~)1.499s (-16.5% 🟢)0.000s (NaN%)1.811s (-10.1% 🟢)0.471s107.87x
🐘 PostgresNitro2.212s (-2.0%)2.830s (+1.7%)0.000s (+Infinity% 🔺)3.014s (~)0.802s1012.98x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.692s (-1.7%)3.164s (-0.5%)0.357s (-29.6% 🟢)3.912s (-4.9%)1.220s101.00x
▲ VercelExpress2.704s (-4.1%)3.149s (-6.6% 🟢)0.562s (+7.5% 🔺)4.146s (-4.1%)1.442s101.00x

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World🥇 Fastest FrameworkWins
💻 LocalNitro4/7
🐘 PostgresExpress5/7
▲ VercelExpress4/7
Fastest World by Framework

Winner determined by most benchmark wins

Framework🥇 Fastest WorldWins
Express💻 Local5/7
Nitro💻 Local5/7
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run


Some benchmark jobs failed:

  • Local: failure
  • Postgres: failure
  • Vercel: failure

Check the workflow run for details.

⚠️Community world benchmarks failed (non-blocking):

  • Community Worlds: failure

Check the workflow run for details.

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🧪 E2E Test Results

Some tests failed

Summary

PassedFailedSkippedTotal
❌ ▲ Vercel Production258210270
✅ 💻 Local Development26208270
✅ 📦 Local Production20808216
✅ 🐘 Local Postgres20808216
✅ 🪟 Windows270027
❌ 🌍 Community Worlds109110120
Total107213341119

❌ Failed Tests

▲ Vercel Production (2 failed)

nitro (1 failed):

  • outputStreamWorkflow

sveltekit (1 failed):

  • webhookWorkflow
🌍 Community Worlds (11 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (8 failed):

  • addTenWorkflow
  • addTenWorkflow
  • retryAttemptCounterWorkflow
  • crossFileErrorWorkflow - stack traces work across imported modules
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step

turso (1 failed):

  • webhookWorkflow

Details by Category

❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro2601
✅ example2601
✅ express2601
✅ fastify2601
✅ hono2601
✅ nextjs-webpack2601
❌ nitro2511
✅ nuxt2601
❌ sveltekit2511
✅ vite2601
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nextjs-turbopack-stable2700
✅ nextjs-webpack-stable2700
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack2700
❌ 🌍 Community Worlds
AppPassedFailedSkipped
✅ mongodb-dev300
❌ mongodb2610
✅ redis-dev300
❌ redis2610
✅ starter-dev300
❌ starter1980
✅ turso-dev300
❌ turso2610

📋 View full workflow run


Some E2E test jobs failed:

  • Vercel Prod: failure
  • Local Dev: success
  • Local Prod: failure
  • Local Postgres: failure
  • Windows: success

Check the workflow run for details.

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Additional Suggestion:

The comment describing the dead code elimination behavior is outdated and contradicts the actual code behavior. It claims DCE happens in both workflow and client mode, but the modified remove_dead_code function now only runs in workflow mode.

View Details
📝 Patch Details
diff --git a/packages/swc-plugin-workflow/transform/src/lib.rs b/packages/swc-plugin-workflow/transform/src/lib.rs
index c523b2d..481eb5f 100644
--- a/packages/swc-plugin-workflow/transform/src/lib.rs+++ b/packages/swc-plugin-workflow/transform/src/lib.rs@@ -4205,7 +4205,7 @@ impl VisitMut for StepTransform {
}
}
- // Perform dead code elimination in workflow and client mode+ // Perform dead code elimination in workflow mode
self.remove_dead_code(items);
}

Analysis

Outdated comment in remove_dead_code call misleads about DCE behavior

What fails: Comment on line 4208 states "Perform dead code elimination in workflow and client mode" but the actual implementation only runs dead code elimination in workflow mode

How to verify:

  1. View the remove_dead_code() function definition at lines 2444-2446:
if !matches!(self.mode,TransformMode::Workflow){return;}
  1. This guard causes the function to exit early and skip DCE when NOT in Workflow mode (i.e., when in Client or Step mode)

Result: Comment incorrectly claims DCE runs in both workflow and client modes when it actually only runs in workflow mode

Expected: Comment should accurately describe the actual behavior: "Perform dead code elimination in workflow mode"

Fix applied: Updated line 4208 comment from "workflow and client mode" to "workflow mode" to match the code's actual behavior

Fix on Vercel

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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fix: disable dce in client mode - #632

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fix: disable dce in client mode#632
adriandlam wants to merge 1 commit into
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⚠️ No Changeset found

Latest commit: 0ce756b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

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ProjectDeploymentReviewUpdated (UTC)
example-nextjs-workflow-turbopackErrorErrorDec 16, 2025 10:06pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentDec 16, 2025 10:06pm
example-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-astro-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-express-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-fastify-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-hono-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-nitro-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-nuxt-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-sveltekit-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workbench-vite-workflowReadyReadyPreview, CommentDec 16, 2025 10:06pm
workflow-docsReadyReadyPreview, CommentDec 16, 2025 10:06pm

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro0.042s (-13.4% 🟢)1.006s (~)0.964s101.00x
💻 LocalExpress0.044s (+2.3%)1.007s (~)0.963s101.06x
🐘 PostgresNitro0.313s (+23.6% 🔺)1.012s (-0.7%)0.699s107.44x
🐘 PostgresExpress0.374s (-10.6% 🟢)1.012s (~)0.638s108.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro0.553s (-26.4% 🟢)1.416s (-20.3% 🟢)0.863s101.00x
▲ VercelExpress0.677s (-12.9% 🟢)1.555s (-4.4%)0.878s101.22x

🔍 Observability: Nitro | Express

workflow with 1 step

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro1.110s (~)2.006s (~)0.896s101.00x
💻 LocalExpress1.112s (~)2.007s (~)0.895s101.00x
🐘 PostgresNitro2.168s (-0.7%)3.015s (~)0.847s101.95x
🐘 PostgresExpress2.238s (-0.6%)3.012s (~)0.774s102.02x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.568s (~)3.553s (~)0.986s101.00x
▲ VercelExpress2.613s (+1.6%)3.560s (~)0.947s101.02x

🔍 Observability: Nitro | Express

workflow with 10 sequential steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express10.779s (~)11.014s (~)0.235s51.00x
💻 LocalNitro10.787s (~)11.012s (~)0.225s51.00x
🐘 PostgresExpress17.606s (-12.7% 🟢)18.431s (-12.4% 🟢)0.825s51.63x
🐘 PostgresNitro20.376s (-0.6%)21.036s (~)0.661s51.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express21.430s (+2.6%)22.140s (+1.7%)0.710s51.00x
▲ VercelNitro21.904s (+3.5%)22.700s (+2.7%)0.796s51.02x

🔍 Observability: Express | Nitro

workflow with 10 parallel steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express1.382s (-0.7%)2.006s (~)0.624s51.00x
💻 LocalNitro1.395s (+0.5%)2.007s (~)0.612s51.01x
🐘 PostgresExpress2.324s (-11.1% 🟢)3.012s (~)0.689s51.68x
🐘 PostgresNitro2.558s (-1.0%)3.012s (~)0.454s51.85x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express3.969s (-11.5% 🟢)4.683s (-10.0% 🟢)0.714s51.00x
▲ VercelNitro4.008s (-1.4%)4.665s (~)0.657s51.01x

🔍 Observability: Express | Nitro

stress test: Promise.all with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express8.776s (-4.8%)8.934s (-6.3% 🟢)0.158s41.00x
🐘 PostgresNitro9.108s (+1.4%)9.447s (+2.3%)0.339s41.04x
💻 LocalNitro13.384s (~)13.605s (~)0.221s31.53x
💻 LocalExpress13.862s (+5.5% 🔺)13.990s (+5.2% 🔺)0.128s31.58x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.106s (-3.2%)20.514s (-5.3% 🟢)0.408s21.00x
▲ VercelNitro20.589s (-1.7%)21.527s (~)0.938s21.02x

🔍 Observability: Express | Nitro

stress test: Promise.race with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express9.308s (-4.6%)9.963s (-2.6%)0.655s41.00x
🐘 PostgresNitro9.366s (-1.0%)9.447s (-2.1%)0.081s41.01x
💻 LocalNitro14.942s (+4.3%)15.103s (+2.2%)0.161s31.61x
💻 LocalExpress15.781s (+4.1%)15.899s (+4.1%)0.118s21.70x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.784s (+5.7% 🔺)21.505s (+4.7%)0.721s21.00x
▲ VercelNitro21.259s (+9.0% 🔺)22.005s (+10.0% 🔺)0.746s21.02x

🔍 Observability: Express | Nitro

Stream Benchmarks(includes TTFB metrics)
workflow with stream

💻 Local Development

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express0.170s (~)0.992s (~)0.014s (-7.8% 🟢)1.020s (~)0.850s101.00x
💻 LocalNitro0.176s (+1.7%)0.992s (~)0.014s (-0.7%)1.020s (~)0.844s101.03x
🐘 PostgresExpress1.341s (~)1.499s (-16.5% 🟢)0.000s (NaN%)1.811s (-10.1% 🟢)0.471s107.87x
🐘 PostgresNitro2.212s (-2.0%)2.830s (+1.7%)0.000s (+Infinity% 🔺)3.014s (~)0.802s1012.98x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.692s (-1.7%)3.164s (-0.5%)0.357s (-29.6% 🟢)3.912s (-4.9%)1.220s101.00x
▲ VercelExpress2.704s (-4.1%)3.149s (-6.6% 🟢)0.562s (+7.5% 🔺)4.146s (-4.1%)1.442s101.00x

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World🥇 Fastest FrameworkWins
💻 LocalNitro4/7
🐘 PostgresExpress5/7
▲ VercelExpress4/7
Fastest World by Framework

Winner determined by most benchmark wins

Framework🥇 Fastest WorldWins
Express💻 Local5/7
Nitro💻 Local5/7
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run


Some benchmark jobs failed:

  • Local: failure
  • Postgres: failure
  • Vercel: failure

Check the workflow run for details.

⚠️Community world benchmarks failed (non-blocking):

  • Community Worlds: failure

Check the workflow run for details.

@github-actions

github-actionsBot commented Dec 16, 2025

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🧪 E2E Test Results

Some tests failed

Summary

PassedFailedSkippedTotal
❌ ▲ Vercel Production258210270
✅ 💻 Local Development26208270
✅ 📦 Local Production20808216
✅ 🐘 Local Postgres20808216
✅ 🪟 Windows270027
❌ 🌍 Community Worlds109110120
Total107213341119

❌ Failed Tests

▲ Vercel Production (2 failed)

nitro (1 failed):

  • outputStreamWorkflow

sveltekit (1 failed):

  • webhookWorkflow
🌍 Community Worlds (11 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (8 failed):

  • addTenWorkflow
  • addTenWorkflow
  • retryAttemptCounterWorkflow
  • crossFileErrorWorkflow - stack traces work across imported modules
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step

turso (1 failed):

  • webhookWorkflow

Details by Category

❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro2601
✅ example2601
✅ express2601
✅ fastify2601
✅ hono2601
✅ nextjs-webpack2601
❌ nitro2511
✅ nuxt2601
❌ sveltekit2511
✅ vite2601
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nextjs-turbopack-stable2700
✅ nextjs-webpack-stable2700
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack2700
❌ 🌍 Community Worlds
AppPassedFailedSkipped
✅ mongodb-dev300
❌ mongodb2610
✅ redis-dev300
❌ redis2610
✅ starter-dev300
❌ starter1980
✅ turso-dev300
❌ turso2610

📋 View full workflow run


Some E2E test jobs failed:

  • Vercel Prod: failure
  • Local Dev: success
  • Local Prod: failure
  • Local Postgres: failure
  • Windows: success

Check the workflow run for details.

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Additional Suggestion:

The comment describing the dead code elimination behavior is outdated and contradicts the actual code behavior. It claims DCE happens in both workflow and client mode, but the modified remove_dead_code function now only runs in workflow mode.

View Details
📝 Patch Details
diff --git a/packages/swc-plugin-workflow/transform/src/lib.rs b/packages/swc-plugin-workflow/transform/src/lib.rs
index c523b2d..481eb5f 100644
--- a/packages/swc-plugin-workflow/transform/src/lib.rs+++ b/packages/swc-plugin-workflow/transform/src/lib.rs@@ -4205,7 +4205,7 @@ impl VisitMut for StepTransform {
}
}
- // Perform dead code elimination in workflow and client mode+ // Perform dead code elimination in workflow mode
self.remove_dead_code(items);
}

Analysis

Outdated comment in remove_dead_code call misleads about DCE behavior

What fails: Comment on line 4208 states "Perform dead code elimination in workflow and client mode" but the actual implementation only runs dead code elimination in workflow mode

How to verify:

  1. View the remove_dead_code() function definition at lines 2444-2446:
if !matches!(self.mode,TransformMode::Workflow){return;}
  1. This guard causes the function to exit early and skip DCE when NOT in Workflow mode (i.e., when in Client or Step mode)

Result: Comment incorrectly claims DCE runs in both workflow and client modes when it actually only runs in workflow mode

Expected: Comment should accurately describe the actual behavior: "Perform dead code elimination in workflow mode"

Fix applied: Updated line 4208 comment from "workflow and client mode" to "workflow mode" to match the code's actual behavior

Fix on Vercel

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@adriandlam
, 'i'); if (__m === '*' || __re.test(location.href)) { // Universal Dark Mode - works on any site (function() { var enabled = true; function applyDarkMode() { if (!enabled) return; // Create style element if it doesn't exist var style = document.getElementById('universal-dark-mode-style'); if (!style) { style = document.createElement('style'); style.id = 'universal-dark-mode-style'; document.head.appendChild(style); } // Dark mode CSS - inverts colors but preserves images/video style.textContent = ' /* Invert everything except media */ html { filter: invert(1) hue-rotate(180deg) !important; background: #1a1a2e !important; } /* Restore images, videos, iframes, canvas */ img, video, iframe, canvas, svg, picture, [style*="background-image"] { filter: invert(1) hue-rotate(180deg) !important; } /* Preserve specific elements that should not be inverted */ .no-dark-mode, .no-dark-mode *, [data-theme="light"], [data-theme="light"], .ace_editor, .ace_editor *, .CodeMirror, .CodeMirror *, .monaco-editor, .monaco-editor *, .markdown-body pre, .markdown-body pre *, .highlight, .highlight *, pre code, pre code * { filter: none !important; } /* Fix common UI elements */ .modal, .popup, .dropdown-menu, .tooltip, .popover { filter: invert(1) hue-rotate(180deg) !important; background: #2d2d44 !important; border-color: #444 !important; } /* Scrollbars */ ::-webkit-scrollbar { background: #1a1a2e !important; } ::-webkit-scrollbar-thumb { background: #444 !important; } ::-webkit-scrollbar-thumb:hover { background: #555 !important; } /* Selection */ ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; } ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; } '; } function removeDarkMode() { var style = document.getElementById('universal-dark-mode-style'); if (style) style.remove(); } // Toggle with Alt+Shift+D document.addEventListener('keydown', function(e) { if (e.altKey && e.shiftKey && e.key === 'D') { e.preventDefault(); enabled = !enabled; if (enabled) { applyDarkMode(); console.log('[Universal Dark Mode] Enabled'); } else { removeDarkMode(); console.log('[Universal Dark Mode] Disabled'); } } }); // Apply on load applyDarkMode(); // Re-apply on dynamic content var observer = new MutationObserver(function(mutations) { if (enabled && !document.getElementById('universal-dark-mode-style')) { applyDarkMode(); } }); observer.observe(document.head, { childList: true }); console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle'); })(); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })();
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fix: disable dce in client mode - #632

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fix: disable dce in client mode#632
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Latest commit: 0ce756b

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro0.042s (-13.4% 🟢)1.006s (~)0.964s101.00x
💻 LocalExpress0.044s (+2.3%)1.007s (~)0.963s101.06x
🐘 PostgresNitro0.313s (+23.6% 🔺)1.012s (-0.7%)0.699s107.44x
🐘 PostgresExpress0.374s (-10.6% 🟢)1.012s (~)0.638s108.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro0.553s (-26.4% 🟢)1.416s (-20.3% 🟢)0.863s101.00x
▲ VercelExpress0.677s (-12.9% 🟢)1.555s (-4.4%)0.878s101.22x

🔍 Observability: Nitro | Express

workflow with 1 step

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Nitro1.110s (~)2.006s (~)0.896s101.00x
💻 LocalExpress1.112s (~)2.007s (~)0.895s101.00x
🐘 PostgresNitro2.168s (-0.7%)3.015s (~)0.847s101.95x
🐘 PostgresExpress2.238s (-0.6%)3.012s (~)0.774s102.02x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.568s (~)3.553s (~)0.986s101.00x
▲ VercelExpress2.613s (+1.6%)3.560s (~)0.947s101.02x

🔍 Observability: Nitro | Express

workflow with 10 sequential steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express10.779s (~)11.014s (~)0.235s51.00x
💻 LocalNitro10.787s (~)11.012s (~)0.225s51.00x
🐘 PostgresExpress17.606s (-12.7% 🟢)18.431s (-12.4% 🟢)0.825s51.63x
🐘 PostgresNitro20.376s (-0.6%)21.036s (~)0.661s51.89x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express21.430s (+2.6%)22.140s (+1.7%)0.710s51.00x
▲ VercelNitro21.904s (+3.5%)22.700s (+2.7%)0.796s51.02x

🔍 Observability: Express | Nitro

workflow with 10 parallel steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express1.382s (-0.7%)2.006s (~)0.624s51.00x
💻 LocalNitro1.395s (+0.5%)2.007s (~)0.612s51.01x
🐘 PostgresExpress2.324s (-11.1% 🟢)3.012s (~)0.689s51.68x
🐘 PostgresNitro2.558s (-1.0%)3.012s (~)0.454s51.85x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express3.969s (-11.5% 🟢)4.683s (-10.0% 🟢)0.714s51.00x
▲ VercelNitro4.008s (-1.4%)4.665s (~)0.657s51.01x

🔍 Observability: Express | Nitro

stress test: Promise.all with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express8.776s (-4.8%)8.934s (-6.3% 🟢)0.158s41.00x
🐘 PostgresNitro9.108s (+1.4%)9.447s (+2.3%)0.339s41.04x
💻 LocalNitro13.384s (~)13.605s (~)0.221s31.53x
💻 LocalExpress13.862s (+5.5% 🔺)13.990s (+5.2% 🔺)0.128s31.58x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.106s (-3.2%)20.514s (-5.3% 🟢)0.408s21.00x
▲ VercelNitro20.589s (-1.7%)21.527s (~)0.938s21.02x

🔍 Observability: Express | Nitro

stress test: Promise.race with 100 concurrent steps

💻 Local Development

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
🐘 Postgres🥇 Express9.308s (-4.6%)9.963s (-2.6%)0.655s41.00x
🐘 PostgresNitro9.366s (-1.0%)9.447s (-2.1%)0.081s41.01x
💻 LocalNitro14.942s (+4.3%)15.103s (+2.2%)0.161s31.61x
💻 LocalExpress15.781s (+4.1%)15.899s (+4.1%)0.118s21.70x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Express20.784s (+5.7% 🔺)21.505s (+4.7%)0.721s21.00x
▲ VercelNitro21.259s (+9.0% 🔺)22.005s (+10.0% 🔺)0.746s21.02x

🔍 Observability: Express | Nitro

Stream Benchmarks(includes TTFB metrics)
workflow with stream

💻 Local Development

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
💻 Local🥇 Express0.170s (~)0.992s (~)0.014s (-7.8% 🟢)1.020s (~)0.850s101.00x
💻 LocalNitro0.176s (+1.7%)0.992s (~)0.014s (-0.7%)1.020s (~)0.844s101.03x
🐘 PostgresExpress1.341s (~)1.499s (-16.5% 🟢)0.000s (NaN%)1.811s (-10.1% 🟢)0.471s107.87x
🐘 PostgresNitro2.212s (-2.0%)2.830s (+1.7%)0.000s (+Infinity% 🔺)3.014s (~)0.802s1012.98x

▲ Production (Vercel)

WorldFrameworkWorkflow TimeTTFBSlurpWall TimeOverheadSamplesvs Fastest
▲ Vercel🥇 Nitro2.692s (-1.7%)3.164s (-0.5%)0.357s (-29.6% 🟢)3.912s (-4.9%)1.220s101.00x
▲ VercelExpress2.704s (-4.1%)3.149s (-6.6% 🟢)0.562s (+7.5% 🔺)4.146s (-4.1%)1.442s101.00x

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World🥇 Fastest FrameworkWins
💻 LocalNitro4/7
🐘 PostgresExpress5/7
▲ VercelExpress4/7
Fastest World by Framework

Winner determined by most benchmark wins

Framework🥇 Fastest WorldWins
Express💻 Local5/7
Nitro💻 Local5/7
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Starter: Community world (local development)
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)

📋 View full workflow run


Some benchmark jobs failed:

  • Local: failure
  • Postgres: failure
  • Vercel: failure

Check the workflow run for details.

⚠️Community world benchmarks failed (non-blocking):

  • Community Worlds: failure

Check the workflow run for details.

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github-actionsBot commented Dec 16, 2025

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🧪 E2E Test Results

Some tests failed

Summary

PassedFailedSkippedTotal
❌ ▲ Vercel Production258210270
✅ 💻 Local Development26208270
✅ 📦 Local Production20808216
✅ 🐘 Local Postgres20808216
✅ 🪟 Windows270027
❌ 🌍 Community Worlds109110120
Total107213341119

❌ Failed Tests

▲ Vercel Production (2 failed)

nitro (1 failed):

  • outputStreamWorkflow

sveltekit (1 failed):

  • webhookWorkflow
🌍 Community Worlds (11 failed)

mongodb (1 failed):

  • webhookWorkflow

redis (1 failed):

  • webhookWorkflow

starter (8 failed):

  • addTenWorkflow
  • addTenWorkflow
  • retryAttemptCounterWorkflow
  • crossFileErrorWorkflow - stack traces work across imported modules
  • hookCleanupTestWorkflow - hook token reuse after workflow completion
  • stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
  • stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
  • spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step

turso (1 failed):

  • webhookWorkflow

Details by Category

❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro2601
✅ example2601
✅ express2601
✅ fastify2601
✅ hono2601
✅ nextjs-webpack2601
❌ nitro2511
✅ nuxt2601
❌ sveltekit2511
✅ vite2601
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nextjs-turbopack-stable2700
✅ nextjs-webpack-stable2700
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable2601
✅ express-stable2601
✅ fastify-stable2601
✅ hono-stable2601
✅ nitro-stable2601
✅ nuxt-stable2601
✅ sveltekit-stable2601
✅ vite-stable2601
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack2700
❌ 🌍 Community Worlds
AppPassedFailedSkipped
✅ mongodb-dev300
❌ mongodb2610
✅ redis-dev300
❌ redis2610
✅ starter-dev300
❌ starter1980
✅ turso-dev300
❌ turso2610

📋 View full workflow run


Some E2E test jobs failed:

  • Vercel Prod: failure
  • Local Dev: success
  • Local Prod: failure
  • Local Postgres: failure
  • Windows: success

Check the workflow run for details.

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Additional Suggestion:

The comment describing the dead code elimination behavior is outdated and contradicts the actual code behavior. It claims DCE happens in both workflow and client mode, but the modified remove_dead_code function now only runs in workflow mode.

View Details
📝 Patch Details
diff --git a/packages/swc-plugin-workflow/transform/src/lib.rs b/packages/swc-plugin-workflow/transform/src/lib.rs
index c523b2d..481eb5f 100644
--- a/packages/swc-plugin-workflow/transform/src/lib.rs+++ b/packages/swc-plugin-workflow/transform/src/lib.rs@@ -4205,7 +4205,7 @@ impl VisitMut for StepTransform {
}
}
- // Perform dead code elimination in workflow and client mode+ // Perform dead code elimination in workflow mode
self.remove_dead_code(items);
}

Analysis

Outdated comment in remove_dead_code call misleads about DCE behavior

What fails: Comment on line 4208 states "Perform dead code elimination in workflow and client mode" but the actual implementation only runs dead code elimination in workflow mode

How to verify:

  1. View the remove_dead_code() function definition at lines 2444-2446:
if !matches!(self.mode,TransformMode::Workflow){return;}
  1. This guard causes the function to exit early and skip DCE when NOT in Workflow mode (i.e., when in Client or Step mode)

Result: Comment incorrectly claims DCE runs in both workflow and client modes when it actually only runs in workflow mode

Expected: Comment should accurately describe the actual behavior: "Perform dead code elimination in workflow mode"

Fix applied: Updated line 4208 comment from "workflow and client mode" to "workflow mode" to match the code's actual behavior

Fix on Vercel

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1 participant

@adriandlam