perf(router-core): replace the LRU cache with a trimmed SIEVE cache by Sheraff · Pull Request #8230 · TanStack/router

Sheraff · 2026-09-03T13:44:23Z

Summary

The hand-rolled doubly-linked LRU in lru-cache.ts relinked every hit that was not already the newest entry. Common router workloads, such as rendering a page of links, repeatedly resolve the same handful of paths, so that relinking was unnecessary hot-path work.

This replaces it with a dependency-free SIEVE cache trimmed to the API the project uses (get, set, clear, fixed max). Entries use the Map's FIFO insertion order and a live iterator as the eviction hand, so each entry only stores its key, value and visited bit. A newest-entry boundary guard preserves canonical SIEVE wraparound instead of allowing the live iterator to visit a newly inserted replacement. The old implementation's stale-oldest eviction edge case (evicting an entry with no next did not advance oldest) is gone with it.

Measurements

Bundle gzip: react-router.minimal 85785 → 85752 (−33 B), react-router.full 89380 → 89340 (−40 B).

An isolated forced-GC probe with 500 full 1000-entry caches measured 117 → 77 bytes per resident entry (−34%). After 5000 replacement inserts per cache it measured 145.7 → 105.8 bytes per resident entry (−27%). These are V8/Node 25 measurements rather than portable object-size guarantees.

Microbenchmark (vitest bench, one describe per case, one bench per implementation, each implementation run in its own process, alternating, two rounds; hz = iterations/s of the whole per-case loop, Node 25):

case (per iteration)	LRU hz	SIEVE hz
get-hit: 200 hot keys	273K / 268K	863K / 869K
get-miss: 200 absent keys	1.26M / 1.24M	1.28M / 1.28M
set-insert: fresh cache, 500 inserts	50.8K / 50.4K	105K / 100K
set-evict: full cache, 200 new keys	19.5K / 19.0K	34.9K / 37.4K
set-evict after 200 hot gets	18.4K / 19.4K	32.4K / 34.7K
mixed 95/5: 190 hot gets + 10 inserts	274K / 217K	445K / 432K
scan-then-return: 200 gets, 1500 inserts, 200 gets	9.1K / 14.3K	15.7K / 15.3K

Hits are about 3.2x faster (5.8 ns vs 18.5 ns per get), misses are effectively unchanged, fresh insertion is about 2x faster, eviction workloads are about 1.8–1.9x faster, and the mixed 95/5 workload is about 1.8x faster. Allocation-heavy cases include GC outliers, so the percentiles and paired rounds are more useful than any single maximum.

Hit ratios replayed from recorded get traces of the links and route-tree-scale client-nav scenarios (200 ticks) are identical for both implementations: those workloads touch 3 to 9 distinct keys per cache, so a 1000-entry cache never evicts there. Paired client-nav benches for links, route-tree-scale and mount (two rounds each, built dist swapped) are flat within noise (min times within 0.5%).

Tests

tests/sieve.test.ts (11): store/read, oldest-unvisited eviction, one-sweep reprieve, second-sweep eviction, hand wrapping, newest-boundary wrapping, repeated eviction, capacity one, overwrite without eviction, clearing an active hand and insertion churn. The resolvePath integration test now verifies real cache reuse. tests/lru.test.ts was removed with the implementation.

Targeted affected suites: 589 passed / 1 expected fail. TypeScript 5.6 through 7.0, eslint, prettier and the complete bundle-size matrix pass.

🤖 Generated with Claude Code

https://claude.ai/code/session_01C1tX2n8xegVBsZqoJPu7iv

Summary by CodeRabbit

New Features
- Added a fixed-capacity cache with usage-aware eviction for routing, path resolution, and server-rendered manifest lookups.
- Improved cache eviction behavior for edge cases, including capacity-one caches and repeated insertions.
Bug Fixes
- Corrected cache eviction handling to better retain recently accessed entries.
Tests
- Added comprehensive coverage for cache storage, eviction, overwrites, clearing, and capacity handling.
- Updated path-caching tests to verify cache reuse.

The hand-rolled doubly-linked LRU relinked the hit entry to the newest position on every `get`. Every cache in the router (resolvePathCache, the route tree's matchCache/singleCache/flatCache, the SSR manifest cache) is hit-dominated: a page of links re-resolves the same handful of paths on every navigation, so the relink was pure overhead. SIEVE (https://cachemon.github.io/SIEVE-website/) keeps a FIFO list and a visited bit per entry; a hit only sets the bit, and eviction sweeps a hand from the oldest entry, clearing bits and dropping the first unvisited one. Same API as before (`get`/`set`/`clear`, fixed `max`), no dependency, and the old implementation's stale-`oldest` eviction edge case is gone. Microbenchmark (ns/op, Node 25): get-hit 17.0 -> 13.9, set-insert 64.9 -> 50.8, set-evict 79.9 -> 79.9, scan-then-return 41.0 -> 34.8, get-miss 16.2 -> 19.3. Hit ratios on the links and route-tree-scale client-nav traces are identical (working sets of 3-9 keys never evict). Bundle gzip: react-router.minimal -8 B, react-router.full -15 B. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01C1tX2n8xegVBsZqoJPu7iv

coderabbitai · 2026-09-03T13:44:32Z

📝 Walkthrough

Walkthrough

Changes

The router-core package replaces its internal LRU caches with a fixed-capacity SIEVE cache. Route processing, path resolution, and SSR manifest lookup use the new cache. Tests cover eviction, updates, clearing, and capacity behavior.

SIEVE cache replacement

Layer / File(s)	Summary
SIEVE cache implementation `packages/router-core/src/sieve-cache.ts`, `packages/router-core/src/lru-cache.ts`	Adds `SieveCache` and `createSieveCache`. Removes the LRU cache implementation.
Router-core cache integrations `packages/router-core/src/new-process-route-tree.ts`, `packages/router-core/src/path.ts`, `packages/router-core/src/router.ts`, `packages/router-core/src/ssr/ssr-server.ts`	Replaces LRU cache types and factories in route processing, path resolution, router state, and SSR manifest caching.
Cache validation and release metadata `packages/router-core/tests/sieve.test.ts`, `packages/router-core/tests/path.test.ts`, `.changeset/sieve-cache.md`	Adds SIEVE eviction tests, updates path cache assertions, and records the patch release.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk:🟡 Moderate · up to a2750

This replaces router caches with SIEVE, but creating a cache with an invalid capacity can cause the first write to hang. Validate cache capacity before merge.

Suggested reviewers:schiller-manuel

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 7 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: replacing the router-core LRU cache with a trimmed SIEVE cache.
Description check	✅ Passed	The description is detailed and relevant. It explains the motivation, implementation, measurements, tests, and expected performance impact. It does not use the template's exact Changes, Checklist, or …
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description is detailed and relevant. It explains the motivation, implementation, measurements, tests, and expected performance impact. It does not use the template's exact Changes, Checklist, or Release Impact sections, but it contains most of the required substantive information.

Full details: Docstring Coverage

Explanation

Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 7 files. (1 skipped: 1 unsupported.)

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nx-cloud · 2026-09-03T13:44:58Z

View your CI Pipeline Execution ↗ for commit a2750b8

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☁️ Nx Cloud last updated this comment at 2026-09-03 16:26:39 UTC

github-actions · 2026-09-03T13:45:52Z

🚀 Changeset Version Preview

5 package(s) bumped directly, 18 bumped as dependents.

🟩 Patch bumps

Package	Version	Reason
`@tanstack/react-router`	1.170.32 → 1.170.33	Changeset
`@tanstack/router-core`	1.171.27 → 1.171.28	Changeset
`@tanstack/solid-router`	1.170.30 → 1.170.31	Changeset
`@tanstack/start-plugin-core`	1.171.39 → 1.171.40	Changeset
`@tanstack/vue-router`	1.170.29 → 1.170.30	Changeset
`@tanstack/react-start`	1.168.49 → 1.168.50	Dependent
`@tanstack/react-start-client`	1.168.30 → 1.168.31	Dependent
`@tanstack/react-start-rsc`	0.1.48 → 0.1.49	Dependent
`@tanstack/react-start-server`	1.167.37 → 1.167.38	Dependent
`@tanstack/router-cli`	1.167.33 → 1.167.34	Dependent
`@tanstack/router-generator`	1.167.33 → 1.167.34	Dependent
`@tanstack/router-plugin`	1.168.35 → 1.168.36	Dependent
`@tanstack/router-vite-plugin`	1.167.35 → 1.167.36	Dependent
`@tanstack/solid-start`	1.168.47 → 1.168.48	Dependent
`@tanstack/solid-start-client`	1.168.29 → 1.168.30	Dependent
`@tanstack/solid-start-server`	1.167.36 → 1.167.37	Dependent
`@tanstack/start-client-core`	1.170.27 → 1.170.28	Dependent
`@tanstack/start-server-core`	1.169.31 → 1.169.32	Dependent
`@tanstack/start-static-server-functions`	1.167.32 → 1.167.33	Dependent
`@tanstack/start-storage-context`	1.167.29 → 1.167.30	Dependent
`@tanstack/vue-start`	1.168.46 → 1.168.47	Dependent
`@tanstack/vue-start-client`	1.167.32 → 1.167.33	Dependent
`@tanstack/vue-start-server`	1.167.36 → 1.167.37	Dependent

github-actions · 2026-09-03T13:49:11Z

Bundle Size Benchmarks

Commit: 9476e30a2de7
Measured at: 2026-09-03T16:15:34.154Z
Baseline source: history:edf0e16ebfe8
Dashboard: bundle-size history

The following scenarios have bundle-size changes compared with the baseline:

Scenario	Current (gzip)	Initial (gzip)	Raw	Brotli	Trend
`react-router.minimal`	83.7 KiB -33 B	83.6 KiB -39 B	262.0 KiB -145 B	72.9 KiB +33 B	▇██████▅▅▅▅▁
`react-router.full`	87.2 KiB -40 B	87.1 KiB -38 B	273.7 KiB -145 B	76.0 KiB -27 B	███████▅▅▅▆▁
`solid-router.minimal`	33.1 KiB -36 B	33.0 KiB -35 B	96.1 KiB -145 B	29.8 KiB -83 B	███████▆▆▆▆▁
`solid-router.full`	37.9 KiB -27 B	37.8 KiB -31 B	110.7 KiB -145 B	34.2 KiB -66 B	▇██████▅▆▆▅▁
`vue-router.minimal`	49.4 KiB -46 B	49.3 KiB -47 B	138.1 KiB -145 B	44.6 KiB -73 B	▇██████▇▆▆▇▁
`vue-router.full`	55.1 KiB -51 B	54.9 KiB -50 B	156.3 KiB -145 B	49.6 KiB -105 B	▇██████▇▆▆▇▁
`react-start.minimal`	96.6 KiB -39 B	96.5 KiB -42 B	304.3 KiB -145 B	83.7 KiB +30 B	▇██████▅▅▅▅▁
`react-start.query-integration`	104.0 KiB -38 B	103.9 KiB -42 B	330.8 KiB -145 B	90.1 KiB -65 B	███▅▅▅▅▁
`react-start.deferred-hydration`	97.4 KiB -37 B	96.5 KiB -38 B	305.6 KiB -145 B	84.4 KiB -80 B	▇██████▅▅▅▅▁
`react-start.full`	99.8 KiB -35 B	99.7 KiB -36 B	314.0 KiB -145 B	86.5 KiB -157 B	▇██████▅▄▄▅▁
`react-start.rsbuild.minimal`	99.9 KiB -41 B	99.8 KiB -41 B	314.6 KiB -148 B	86.2 KiB -17 B	███████▅▅▅▅▁
`react-start.rsbuild.minimal-iife`	100.3 KiB -41 B	100.2 KiB -41 B	315.5 KiB -148 B	86.5 KiB -94 B	███████▅▅▅▅▁
`react-start.rsbuild.full`	103.3 KiB -40 B	103.1 KiB -40 B	324.7 KiB -148 B	89.0 KiB +140 B	███████▆▆▅▅▁
`solid-start.minimal`	45.9 KiB -33 B	45.8 KiB -34 B	137.2 KiB -145 B	40.9 KiB -45 B	███████▆▆▆▆▁
`solid-start.deferred-hydration`	49.0 KiB -30 B	45.9 KiB -34 B	144.7 KiB -145 B	43.7 KiB 0 B	▇██████▆▅▅▆▁
`solid-start.full`	51.0 KiB -34 B	50.9 KiB -34 B	152.6 KiB -145 B	45.3 KiB -4 B	▇██████▆▆▆▇▁
`vue-start.minimal`	65.6 KiB -45 B	65.5 KiB -45 B	189.0 KiB -145 B	58.3 KiB -99 B	▇██████▆▇▇▇▁
`vue-start.full`	69.4 KiB -53 B	69.3 KiB -52 B	201.3 KiB -145 B	61.7 KiB +12 B	▇██████▆▆▆▇▁

Current gzip tracks all emitted client JS chunks. Initial gzip tracks only the entry/import graph. Trend sparkline is historical current gzip ending with this PR measurement; lower is better.

pkg-pr-new · 2026-09-03T13:49:42Z

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commit: a2750b8

codspeed-hq · 2026-09-03T13:58:54Z

Merging this PR will improve performance by 4.15%

⚠️

Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.
Open the report in CodSpeed to investigate

⚡ 11 improved benchmarks
❌ 9 (👁 9) regressed benchmarks
✅ 160 untouched benchmarks

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	Memory	`mem server peak-large-page (react)`	2.3 MB	1.2 MB	+99.46%
⚡	Memory	`mem server error-paths unmatched (react)`	750.3 KB	419.2 KB	+79%
⚡	Memory	`mem client navigation-churn (solid)`	651.4 KB	580.7 KB	+12.19%
⚡	Simulation	`client-control-flow navigation loop (react)`	114.4 ms	105.3 ms	+8.61%
⚡	Memory	`mem server error-paths redirect (solid)`	378.3 KB	350.4 KB	+7.97%
⚡	Memory	`mem client interrupted-navigations (vue)`	371 KB	348.2 KB	+6.55%
⚡	Memory	`mem server server-fn-churn (react)`	393.5 KB	372.3 KB	+5.7%
⚡	Memory	`mem server error-paths not-found (solid)`	569.6 KB	542.1 KB	+5.07%
⚡	Memory	`mem client navigation-churn (vue)`	1.5 MB	1.5 MB	+3.68%
⚡	Memory	`mem server error-paths not-found (vue)`	519.3 KB	501.6 KB	+3.54%
⚡	Memory	`mem server error-paths redirect (react)`	311.8 KB	301.8 KB	+3.33%
👁	Simulation	`ssr dehydrate rich types (solid)`	208.1 ms	216 ms	-3.66%
👁	Memory	`mem server error-paths redirect (vue)`	415.9 KB	476.3 KB	-12.67%
👁	Memory	`mem server peak-large-page (vue)`	1 MB	1.1 MB	-7.48%
👁	Simulation	`client-async-pipeline navigation loop (react)`	61.5 ms	63.7 ms	-3.41%
👁	Simulation	`client-nested-params navigation loop (react)`	136.9 ms	151 ms	-9.35%
👁	Memory	`mem server peak-large-page (solid)`	1 MB	1.2 MB	-13.53%
👁	Memory	`mem server serialization-payload (solid)`	4.6 MB	6.3 MB	-26.7%
👁	Memory	`mem server error-paths not-found (react)`	433.9 KB	450 KB	-3.58%
👁	Memory	`mem client unique-location-churn (react)`	666.8 KB	759.9 KB	-12.25%

Tip

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_{Comparing perf/sieve-cache (a2750b8) with main (edf0e16)}

chatgpt-codex-connector · 2026-09-03T16:31:57Z

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In `@packages/router-core/src/sieve-cache.ts`:
- Line 20: Validate the max capacity parameter before constructing the cache,
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.changeset/sieve-cache.md
packages/router-core/src/lru-cache.ts
packages/router-core/src/new-process-route-tree.ts
packages/router-core/src/path.ts
packages/router-core/src/router.ts
packages/router-core/src/sieve-cache.ts
packages/router-core/src/ssr/ssr-server.ts
packages/router-core/tests/lru.test.ts
packages/router-core/tests/path.test.ts
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github-actionsBot added the package: router-core label Sep 3, 2026

perf(router-core): trim SIEVE cache nodes
a2750b8

Sheraff marked this pull request as ready for review September 3, 2026 16:31

coderabbitaiBot reviewed Sep 3, 2026
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Comment threadpackages/router-core/src/sieve-cache.ts

Sheraff merged commit ee28348 into mainSep 4, 2026
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Sheraff deleted the perf/sieve-cache branch September 4, 2026 18:56

This was referenced Sep 4, 2026
ci: Version Packages #8182
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ci: Version Packages LadyBluenotes/router#2
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perf(router-core): replace the LRU cache with a trimmed SIEVE cache - #8230

perf(router-core): replace the LRU cache with a trimmed SIEVE cache#8230
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Sheraff commented Sep 3, 2026• edited by coderabbitai BotLoading Uh oh! There was an error while loading. Please reload this page.

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Summary

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Summary by CodeRabbit

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Walkthrough

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github-actionsBot commented Sep 3, 2026

🚀 Changeset Version Preview

🟩 Patch bumps

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Bundle Size Benchmarks

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Merging this PR will improve performance by 4.15%

Performance Changes

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Sheraff commented Sep 3, 2026•
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