perf(router-core): avoid redundant promises for ready routes by Sheraff · Pull Request #8244 · TanStack/router

Sheraff · 2026-09-04T23:39:44Z

🎯 Changes

Remove redundant promise work during client navigation when loader data and route components are ready. Loader settlement continuations are attached only for blocking loads, and waitFor cleanup uses then after its native settlement callbacks. An immediate async wrapper starts chunk loading, catches synchronous preload exceptions, and installs a cancellable wait only for actual chunk promises.

This PR contains only the production change, correctness unit tests, and a changeset. Tests cover abort-listener cleanup, throwing thenables, cached parent snapshots, component failures/retries, external cancellation, and simultaneous loader/preload error precedence. Navigation from inside component preload is undefined behavior and is not asserted.

Performance and size

Previously collected production measurements for this unchanged implementation showed 4.08% faster deep cached Chromium navigation completion (95% interval: 3.37%–4.83%) and 5.80% lower Node CPU time (4.34%–7.07%). Node wall time was inconclusive. These are single-machine results, not paint-latency or universal application-speedup claims.

The simpler wrapper is an accepted tradeoff: one fewer promise per match and smaller bundles than the deferred wrapper, with an uncertain incremental runtime effect. Pending-component workloads leaned approximately 1–2% slower; the larger repeated comparison did not establish a reproducible regression. No additional speedup is claimed for that choice.

Against main, React Router minimal is 6 gzip bytes smaller and full is 3 bytes larger; all 18 measured scenarios range from -12 to +4 bytes. Benchmark fixtures, runners, raw results, and the RESULT report are excluded from this PR.

Validation

pnpm test:eslint, pnpm test:types, and pnpm test:unit rerun after cleanup.
Retained core/React correctness coverage: 2,710 passing unit tests, four expected failures and one skip.
The unchanged production code also passed 24 Chromium e2e tests, the React basic example smoke check, and the full 18-scenario bundle build.
git diff --check passes; retained production/tests/changeset contents are unchanged by this cleanup.

Earlier CodSpeed memory flags remain unresolved; the reported runtime-environment mismatch and local latency measurements do not establish that those flags are harmless.

Related: #8004.

✅ Checklist

I have followed the steps in the Contributing guide.
I have tested code changes locally with the relevant test commands, or tests do not apply to this pull request.
I fully understand the code in this pull request, including any code generated with AI assistance.

🚀 Release Impact

This change affects published code, and I have generated a changeset.
This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

Performance
- Improved client-side navigation performance by reducing unnecessary promise allocations when loader data and route components are already available.
Bug Fixes
- Improved handling of cached route data during navigation.
- Fixed component preload and loader error handling, including retries and error prioritization.
- Improved navigation behavior when routes are not found or superseded.
- Ensured cancelled or completed waits consistently clean up their event listeners.

chatgpt-codex-connector · 2026-09-04T23:40:01Z

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-04T23:42:33.790252Z	`2a4a3fa`	PR opened

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nx-cloud · 2026-09-04T23:40:18Z

View your CI Pipeline Execution ↗ for commit 58ba62c

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coderabbitai · 2026-09-04T23:40:49Z

No actionable comments were generated in the recent review. 🎉

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packages/router-core/src/load-client.ts

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📝 Walkthrough

Walkthrough

The router core changes waitFor cleanup, client loader and route-chunk settlement, and retained-route handling. New tests cover abort paths, cached route loading, synchronous failures, superseding navigation, and parent snapshot behavior. A patch changeset records the optimization.

Changes

Ready-route navigation optimization

Layer / File(s)	Summary
Promise and abort-listener cleanup `packages/router-core/src/load-client.ts`, `packages/router-core/tests/load-client-wait-for.test.ts`	`waitFor` removes its abort listener after normal settlement, aborts, and thenable errors. Tests verify listener registration, removal, and late rejection handling.
Loader and component-chunk settlement `packages/router-core/src/load-client.ts`, `packages/router-core/tests/ready-route-loading.test.ts`, `.changeset/tame-banks-wear.md`	Blocking loader outcomes and immediate fallback outcomes are handled separately. Route chunks load only when needed, and synchronous preload failures use the chunk error path. Tests cover cached loaders, chunk outcomes, retries, superseding navigation, and loader-error precedence.
Retained routes and parent snapshots `packages/router-core/src/load-client.ts`, `packages/router-core/tests/ready-route-parent-snapshot.test.ts`	Not-found boundary matches count as retained. Tests verify parent cached snapshots, reload errors, loader gating, and selected errors during child navigation.

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

Merge Risk: 🔵 Low · up to 58ba6

This optimizes ready-route navigation and preserves tested loader, chunk, cancellation, and not-found handling. Earlier memory-regression flags remain unresolved, leaving a bounded performance concern before release.

Sequence Diagram(s)

sequenceDiagram
  participant RouterNavigation
  participant createLoaderTask
  participant RouteChunk
  participant waitFor
  RouterNavigation->>createLoaderTask: start client navigation
  createLoaderTask->>RouteChunk: preload component chunk when present
  createLoaderTask->>waitFor: await loader work with abort signal
  waitFor-->>createLoaderTask: settle and remove abort listener
  createLoaderTask-->>RouterNavigation: return navigation outcome

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 12 files.	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 performance change: removing redundant promises for ready routes in router-core.
Description check	✅ Passed	The description is detailed and covers the changes, motivation, validation, performance impact, checklist, and release impact. One non-critical checklist item remains unchecked, but the description is…
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.

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github-actions · 2026-09-04T23:41:10Z

🚀 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 · 2026-09-04T23:44:29Z

Bundle Size Benchmarks

Commit: 2c18bb2a0fbd
Measured at: 2026-09-05T07:59:48.760Z
Baseline source: history:f0b5eda54460
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`	83.8 KiB +1 B	83.6 KiB -3 B	262.0 KiB -30 B	72.9 KiB -92 B	███▅▅▅▅▁▃▃▃▃
`react-router.full`	87.3 KiB +2 B	87.1 KiB +1 B	273.8 KiB -30 B	76.0 KiB -29 B	███▅▅▅▆▁▄▄▄▄
`solid-router.minimal`	33.1 KiB +3 B	33.0 KiB +2 B	96.1 KiB -30 B	29.9 KiB +20 B	███▆▆▆▆▁▆▆▆▇
`solid-router.full`	38.0 KiB -1 B	37.8 KiB +1 B	110.8 KiB -30 B	34.2 KiB -16 B	███▅▆▆▅▁▄▄▅▄
`vue-router.minimal`	49.4 KiB -4 B	49.3 KiB -5 B	138.2 KiB -30 B	44.7 KiB -2 B	███▇▆▆▇▁▃▄▄▄
`vue-router.full`	55.1 KiB -4 B	54.9 KiB -5 B	156.4 KiB -30 B	49.5 KiB -19 B	███▇▆▆▇▁▃▄▄▃
`react-start.minimal`	96.7 KiB -5 B	96.5 KiB -4 B	304.3 KiB -30 B	83.8 KiB +134 B	███▅▅▅▅▁▃▄▄▄
`react-start.query-integration`	104.0 KiB -1 B	103.9 KiB -1 B	330.8 KiB -30 B	90.1 KiB -59 B	███▅▅▅▅▁▃▄▄▄
`react-start.deferred-hydration`	97.4 KiB -6 B	96.6 KiB -2 B	305.7 KiB -30 B	84.5 KiB +102 B	███▅▅▅▅▁▂▄▄▃
`react-start.full`	99.8 KiB -6 B	99.7 KiB -4 B	314.0 KiB -30 B	86.5 KiB +32 B	███▅▄▄▅▁▃▄▄▄
`react-start.rsbuild.minimal`	99.9 KiB -6 B	99.8 KiB -6 B	314.6 KiB -31 B	86.2 KiB +8 B	███▅▅▅▅▁▂▂▂▂
`react-start.rsbuild.minimal-iife`	100.3 KiB -7 B	100.2 KiB -7 B	315.6 KiB -31 B	86.5 KiB -77 B	███▅▅▅▅▁▂▂▂▁
`react-start.rsbuild.full`	103.3 KiB -7 B	103.1 KiB -7 B	324.7 KiB -31 B	89.1 KiB +70 B	███▆▆▅▅▁▂▂▂▁
`solid-start.minimal`	46.0 KiB -2 B	45.9 KiB -1 B	137.2 KiB -30 B	40.9 KiB +53 B	███▆▆▆▆▁▄▅▆▆
`solid-start.deferred-hydration`	49.1 KiB -1 B	45.9 KiB -1 B	144.7 KiB -30 B	43.7 KiB +93 B	███▆▅▅▆▁▅▆▇▇
`solid-start.full`	51.1 KiB +1 B	50.9 KiB 0 B	152.6 KiB -30 B	45.2 KiB -25 B	███▆▆▆▇▁▄▄▄▅
`vue-start.minimal`	65.6 KiB +2 B	65.5 KiB +1 B	189.0 KiB -30 B	58.4 KiB +45 B	███▆▇▇▇▁▃▄▄▄
`vue-start.full`	69.4 KiB +2 B	69.3 KiB +1 B	201.3 KiB -30 B	61.7 KiB +8 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 · 2026-09-04T23:45:01Z

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commit: 58ba62c

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In `@scripts/benchmarks/ready-routes/compare.mjs`:
- Line 129: Update the worker process options near the existing maxBuffer
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.changeset/tame-banks-wear.md
RESULT-optimization-ready-route-promises.md
benchmarks/client-nav/react/tsconfig.json
benchmarks/client-nav/ready-routes.tsx
packages/router-core/src/load-client.ts
packages/router-core/tests/load-client-wait-for.test.ts
packages/router-core/tests/ready-route-chunk-supersession.test.ts
packages/router-core/tests/ready-route-loading.test.ts
packages/router-core/tests/ready-route-parent-snapshot.test.ts
packages/router-core/tests/ready-routes.bench.ts
packages/router-core/tests/ready-routes.fixture.ts
scripts/benchmarks/ready-routes/allocations.mjs
scripts/benchmarks/ready-routes/browser.mjs
scripts/benchmarks/ready-routes/compare.mjs
scripts/benchmarks/ready-routes/results/allocations.json
scripts/benchmarks/ready-routes/results/browser-aa.json
scripts/benchmarks/ready-routes/results/browser-primary.json
scripts/benchmarks/ready-routes/results/bundles.json
scripts/benchmarks/ready-routes/results/core-aa.json
scripts/benchmarks/ready-routes/results/core-primary.json
scripts/benchmarks/ready-routes/results/core-replication.json
scripts/benchmarks/ready-routes/results/core-reverse.json
scripts/benchmarks/ready-routes/results/hunk-chunk.json
scripts/benchmarks/ready-routes/results/hunk-cleanup.json
scripts/benchmarks/ready-routes/results/hunk-settlement.json
scripts/benchmarks/ready-routes/summarize.mjs

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codspeed-hq · 2026-09-04T23:56:55Z

Merging this PR will improve performance by 12.71%

⚠️

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

⚡ 13 improved benchmarks
❌ 8 (👁 8) regressed benchmarks
✅ 159 untouched benchmarks

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	Memory	`mem server request-churn (vue)`	3,468.8 KB	856.4 KB	×4.1
⚡	Memory	`mem server error-paths redirect (solid)`	902 KB	423.4 KB	×2.1
⚡	Memory	`mem server error-paths error (vue)`	1,993.1 KB	943.8 KB	×2.1
⚡	Memory	`mem server aborted-requests (vue)`	1.1 MB	1 MB	+13.41%
⚡	Simulation	`client-loaders navigation loop (react)`	77.4 ms	71 ms	+9.03%
⚡	Memory	`mem client unique-location-churn (vue)`	460.2 KB	423.4 KB	+8.7%
⚡	Memory	`mem server error-paths not-found (react)`	439.2 KB	406.2 KB	+8.13%
⚡	Simulation	`client-loaders navigation loop (vue)`	92.7 ms	87 ms	+6.48%
⚡	Memory	`mem server server-fn-churn (vue)`	373.4 KB	354.2 KB	+5.4%
⚡	Memory	`mem client loader-data-retention (solid)`	163.8 KB	156.9 KB	+4.39%
⚡	Simulation	`client-loaders navigation loop (solid)`	140.8 ms	135.1 ms	+4.19%
⚡	Memory	`mem server server-fn-churn (react)`	393.7 KB	380.7 KB	+3.4%
⚡	Memory	`mem client unique-location-churn (solid)`	243.9 KB	235.9 KB	+3.38%
👁	Simulation	`ssr server-fn POST (solid)`	159.5 ms	165.4 ms	-3.58%
👁	Memory	`mem server error-paths unmatched (solid)`	573.6 KB	596.5 KB	-3.84%
👁	Memory	`mem server error-paths redirect (vue)`	403 KB	451.3 KB	-10.72%
👁	Simulation	`client-nested-params navigation loop (react)`	137.2 ms	149.4 ms	-8.22%
👁	Memory	`mem server error-paths unmatched (react)`	594.2 KB	982.7 KB	-39.53%
👁	Memory	`mem client navigation-churn (vue)`	1.5 MB	1.6 MB	-6.2%
👁	Memory	`mem client mount-unmount (solid)`	481.3 KB	557.2 KB	-13.62%
...	...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

Tip

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Inline comments:
In `@RESULT-optimization-ready-route-promises.md`:
- Around line 140-143: Run the repository’s memory-server and memory-client
CodSpeed benchmarks for the final React, Solid, and Vue implementations,
measuring heap usage and garbage-collection cost. Investigate and fix any
reproduced allocation regressions; otherwise document an explicit waiver
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RESULT-optimization-ready-route-promises.md
packages/router-core/src/load-client.ts
scripts/benchmarks/ready-routes/results/preload-scheduling/bundles.json
scripts/benchmarks/ready-routes/results/preload-scheduling/final-browser.json
scripts/benchmarks/ready-routes/results/preload-scheduling/final-core.json
scripts/benchmarks/ready-routes/results/preload-scheduling/incremental-core.json
scripts/benchmarks/ready-routes/results/preload-scheduling/incremental-reverse.json

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We investigated this failure and determined it is unrelated to the PR's changes. The error originates in a pre-built e2e-utils artifact (dist/esm/index.js) that references a missing export (e2eStartDummyServer) from eSetupTeardown.js — a broken build state in the shared e2e infrastructure. Our changes are scoped entirely to router-core and do not touch any e2e utilities.

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Sheraff added 3 commits September 5, 2026 01:16

test(router-core): add ready-route performance controls

985a611

test(router-core): type throwing thenable getter explicitly

1ef2d67

perf(router-core): avoid redundant promises for ready routes

2a4a3fa

Sheraff requested a review from a team as a code owner September 4, 2026 23:39

github-actions Bot added the package: router-core label Sep 4, 2026

coderabbitai Bot reviewed Sep 4, 2026

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Comment thread scripts/benchmarks/ready-routes/compare.mjs Outdated

Sheraff added 3 commits September 5, 2026 02:15

test(router-core): restrict preload coverage to supported behavior

1cfb377

docs(router-core): record immediate preload scheduling experiment

06afabb

perf(router-core): keep the simpler immediate chunk wrapper

9bb751c

coderabbitai Bot reviewed Sep 5, 2026

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Comment thread RESULT-optimization-ready-route-promises.md Outdated

Sheraff added 2 commits September 5, 2026 09:52

chore: remove ready-route benchmark artifacts

996d633

Merge branch 'main' into codex/ready-route-promises

58ba62c

nx-cloud Bot reviewed Sep 5, 2026

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Sheraff merged commit c18e690 into main Sep 5, 2026
29 of 32 checks passed

Sheraff deleted the codex/ready-route-promises branch September 5, 2026 09:24

This was referenced Sep 5, 2026

ci: Version Packages #8182

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ci: Version Packages LadyBluenotes/router#2

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🎯 Changes

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github-actions Bot commented Sep 4, 2026

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Merging this PR will improve performance by 12.71%

Performance Changes

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