refactor(router-core): SSR load-matches can skip some updateMatch() calls by Sheraff · Pull Request #6720 · TanStack/router

Sheraff · 2026-02-21T11:17:17Z

Benchmark

a series of 5 runs of the flamegraph benchmark hitting / (100 links test) yields these results. The improvement is small, but it seems consistent.

Metric	Main mean	PR mean	Delta mean (PR-main)	Main median	PR median	Delta median (PR-main)
Total requests	245,696.0	249,406.4	+3,710.4 (+1.51%)	242,370	245,328	+2,958 (+1.22%)
Requests/sec	8,190.32	8,313.60	+123.28 (+1.51%)	8,079.40	8,176.94	+97.54 (+1.21%)
Latency avg (ms)	0.806	0.748	-0.058 (-7.20%)	0.85	0.80	-0.05 (-5.88%)
Latency p99 (ms)	2.60	2.60	0.00 (0.00%)	3.00	3.00	0.00 (0.00%)
Throughput (MB/s)	16.73	16.98	+0.25 (+1.51%)	16.50	16.70	+0.20 (+1.21%)

Raw results:

main run 1 => total=240537 rps=8018.4 lat_avg_ms=0.89 lat_p99_ms=3 throughput_mb_s=16.38
=== main run 2/5 ===
main run 2 => total=252176 rps=8405.47 lat_avg_ms=0.71 lat_p99_ms=2 throughput_mb_s=17.17
=== main run 3/5 ===
main run 3 => total=242370 rps=8079.4 lat_avg_ms=0.85 lat_p99_ms=3 throughput_mb_s=16.50
=== main run 4/5 ===
main run 4 => total=241498 rps=8050.74 lat_avg_ms=0.86 lat_p99_ms=3 throughput_mb_s=16.45
=== main run 5/5 ===
main run 5 => total=251899 rps=8397.6 lat_avg_ms=0.72 lat_p99_ms=2 throughput_mb_s=17.15

pr-6720 run 1 => total=257058 rps=8568.8 lat_avg_ms=0.65 lat_p99_ms=2 throughput_mb_s=17.50
=== pr-6720 run 2/5 ===
pr-6720 run 2 => total=244657 rps=8155.8 lat_avg_ms=0.81 lat_p99_ms=3 throughput_mb_s=16.66
=== pr-6720 run 3/5 ===
pr-6720 run 3 => total=244632 rps=8154.34 lat_avg_ms=0.81 lat_p99_ms=3 throughput_mb_s=16.66
=== pr-6720 run 4/5 ===
pr-6720 run 4 => total=255357 rps=8512.14 lat_avg_ms=0.67 lat_p99_ms=2 throughput_mb_s=17.39
=== pr-6720 run 5/5 ===
pr-6720 run 5 => total=245328 rps=8176.94 lat_avg_ms=0.8 lat_p99_ms=3 throughput_mb_s=16.70

Summary by CodeRabbit

Bug Fixes

Improved overall server-side rendering stability during resource preloading and loading operations by enhancing state management behavior and consistency
Fixed inconsistencies in state management that were occurring between server and client implementations during load and preload phases
Refined the handling of loading indicators and state transitions within modern server-side rendering environments

…alls

nx-cloud · 2026-02-21T11:17:43Z

View your CI Pipeline Execution ↗ for commit c08a707

Command	Status	Duration	Result
`nx affected --targets=test:eslint,test:unit,tes...`	✅ Succeeded	19m 50s	View ↗
`nx run-many --target=build --exclude=examples/*...`	✅ Succeeded	1m 42s	View ↗

☁️ Nx Cloud last updated this comment at 2026-02-21 11:38:11 UTC

coderabbitai · 2026-02-21T11:18:21Z

No actionable comments were generated in the recent review. 🎉

📝 Walkthrough

Walkthrough

SSR-aware gating added to the loader pipeline to prevent client-specific state mutations during before-load and loader execution. Conditional checks skip abortController assignment and isFetching updates on the server while preserving client-side behavior.

Changes

Cohort / File(s)	Summary
SSR-aware loader state gating `packages/router-core/src/load-matches.ts`	Added server-side conditional logic to skip `abortController` assignment and `isFetching` state updates during `executeBeforeLoad` and `runLoader` execution, preventing client/server mismatches in preloading and loading phases.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

TanStack/router#4971: Modifies executeBeforeLoad and runLoader functions with SSR gating and per-match state handling in the same file.
TanStack/router#4992: Changes before-load orchestration and server-side behavior gating in packages/router-core/src/load-matches.ts.
TanStack/router#6517: Modifies executeBeforeLoad with SSR-aware gating logic in the same loader pipeline file.

Suggested reviewers

schiller-manuel
nlynzaad

Poem

🐰 Hopping through the SSR streams,
Gating state from server dreams,
Client-side stays fresh and clean,
No mutations in between! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: SSR-aware optimization that skips certain updateMatch() calls during load-matches processing on the server.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

Create PR with unit tests
Post copyable unit tests in a comment
Commit unit tests in branch refactor-router-core-ssr-load-matches-skip-match-updates

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pkg-pr-new · 2026-02-21T11:21:01Z

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commit: c08a707

refactor(router-core): SSR load-matches can skip some updateMatch() c…

c08a707

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github-actions bot added the package: router-core label Feb 21, 2026

schiller-manuel approved these changes Feb 21, 2026

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refactor(router-core): SSR load-matches can skip some updateMatch() calls#6720

refactor(router-core): SSR load-matches can skip some updateMatch() calls#6720
Sheraff wants to merge 1 commit intomainfrom
refactor-router-core-ssr-load-matches-skip-match-updates

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