perf(router-core): optimize route tree processing

[Sheraff]

Summary

• fuse static and dynamic route-node construction while preserving case sensitivity, parser reuse, wildcard aliases, parent links, and trie depth
• record dynamic sibling arrays only when they first need sorting, then sort them once after construction instead of walking the full trie
• derive matcher frame depth from trie nodes instead of carrying duplicate depth state
• consolidate and expand regression coverage for sibling ordering, parser priorities and fallback, static-node reuse, route masks, case sensitivity, and pathless/optional depth
• add a patch changeset for @tanstack/router-core

Consolidates

This replaces the overlapping work in:

• perf(router-core): fuse static route node construction #7981
• perf(router-core): fuse dynamic route node construction #7974
• perf(router-core): derive match frame depth #7973
• Optimize route tree sibling sorting #7969

#7974's fused dynamic-node implementation subsumes #7969's production sorting change; #7969's unique ordering tests are retained.

Runtime performance

Compared with origin/main at 697ebb6d using the same focused Vitest benchmark files in separate worktrees:

• general route-tree construction: 7.6% to 10.7% faster across mostly-static, dense-dynamic, reused-shape, and route-mask cases
• static construction: 3.5% to 14.1% faster across sensitive/insensitive and shared/unique-prefix cases
• route matching: 5.4% to 8.4% faster across deep-static and optional-segment distributions

No focused runtime case regressed.

Validation

• router-core unit: 105 files passed; 1,536 tests passed; 3 expected failures
• router-core types: TypeScript 5.6 through 7.0 passed
• router-core ESLint: 0 errors (26 existing warnings outside this diff)
• focused construction/static/matching benchmarks compared against origin/main
• Prettier, git diff --check, and changeset status passed
• five independent reviews found no correctness or runtime-performance blocker

Summary by CodeRabbit

• Performance

  • Improved route-tree construction and route matching performance.
  • Enhanced prioritization of dynamic, optional, and wildcard routes for more accurate matching.

• Bug Fixes

  • Improved handling of case-insensitive paths, pathless routes, route masks, and fallback matching.
  • Prevented route ordering issues when multiple routes have similar patterns.

• Tests

  • Expanded coverage for route specificity, node reuse, wildcard handling, and route-mask behavior.

[coderabbitai]

📝 Walkthrough

Walkthrough

Route-tree construction now resolves route-local options, reuses trie nodes, and sorts only newly populated dynamic sibling lists. Matching derives depth from trie nodes. Tests cover route and route-mask specificity, fallback, reuse, case handling, and pathless routes.

Changes

Route tree optimization

Layer / File(s)	Summary
Route parsing and selective sibling sorting packages/router-core/src/new-process-route-tree.ts, .changeset/faster-route-trees.md	Route parsing groups dynamic, optional, and wildcard nodes into recorded sibling lists. Construction sorts only those lists instead of recursively sorting the full tree.
Trie-derived matcher specificity packages/router-core/src/new-process-route-tree.ts	Match frames no longer store depth. Optional skip masks and specificity comparisons derive depth from trie nodes.
Route and mask matching coverage packages/router-core/tests/new-process-route-tree.test.ts	Tests cover specificity ordering, parser fallback, node reuse, case handling, pathless tie-breaking, and route-mask matching.

Estimated code review effort: 4 (Complex) | ~45 minutes

Sequence Diagram(s)

sequenceDiagram
  participant RouteParser
  participant Trie
  participant RouteMatcher
  RouteParser->>Trie: Build nodes from resolved route paths
  Trie-->>RouteParser: Record dynamic sibling lists
  RouteParser->>Trie: Sort recorded lists
  RouteMatcher->>Trie: Read node depth during matching
  Trie-->>RouteMatcher: Return trie-derived specificity

Loading

Possibly related PRs

• TanStack/router#7969: Both changes optimize dynamic, optional, and wildcard sibling sorting.
• TanStack/router#7973: Both changes remove explicit match-frame depth and use trie-node depth.
• TanStack/router#7974: Both changes update route parsing, dynamic-node reuse, sorting, and matching tests.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: optimizing route tree processing in router-core.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/consolidate-route-tree-optimizations

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[github-actions]

🚀 Changeset Version Preview

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

🟩 Patch bumps

Package	Version	Reason
@tanstack/react-router	1.170.20 → 1.170.21	Changeset
@tanstack/router-core	1.171.17 → 1.171.18	Changeset
@tanstack/solid-router	1.170.20 → 1.170.21	Changeset
@tanstack/start-server-core	1.169.20 → 1.169.21	Changeset
@tanstack/vue-router	1.170.19 → 1.170.20	Changeset
@tanstack/react-start	1.168.37 → 1.168.38	Dependent
@tanstack/react-start-client	1.168.18 → 1.168.19	Dependent
@tanstack/react-start-rsc	0.1.36 → 0.1.37	Dependent
@tanstack/react-start-server	1.167.25 → 1.167.26	Dependent
@tanstack/router-cli	1.167.23 → 1.167.24	Dependent
@tanstack/router-generator	1.167.23 → 1.167.24	Dependent
@tanstack/router-plugin	1.168.25 → 1.168.26	Dependent
@tanstack/router-vite-plugin	1.167.25 → 1.167.26	Dependent
@tanstack/solid-start	1.168.36 → 1.168.37	Dependent
@tanstack/solid-start-client	1.168.18 → 1.168.19	Dependent
@tanstack/solid-start-server	1.167.25 → 1.167.26	Dependent
@tanstack/start-client-core	1.170.16 → 1.170.17	Dependent
@tanstack/start-plugin-core	1.171.28 → 1.171.29	Dependent
@tanstack/start-static-server-functions	1.167.21 → 1.167.22	Dependent
@tanstack/start-storage-context	1.167.19 → 1.167.20	Dependent
@tanstack/vue-start	1.168.35 → 1.168.36	Dependent
@tanstack/vue-start-client	1.167.21 → 1.167.22	Dependent
@tanstack/vue-start-server	1.167.25 → 1.167.26	Dependent

[coderabbitai]

Actionable comments posted: 1

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

packages/router-core/src/new-process-route-tree.ts (1)

262-305: 🩺 Stability & Availability | 🟡 Minor | ⚡ Quick win

Pass dynamicListsToSort through findSingleMatch.

parseSegments is not exported, but findSingleMatch calls it without dynamicListsToSort. A single top-level flat route containing two or more sibling dynamic segments can remain unsorted, so matches may pick lower-priority siblings before declaration order is restored.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/router-core/src/new-process-route-tree.ts` around lines 262 - 305,
Update findSingleMatch to accept and pass dynamicListsToSort into its
parseSegments call, preserving the existing sorting behavior for sibling dynamic
segments in top-level flat routes.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/router-core/src/new-process-route-tree.ts`:
- Around line 1092-1096: The skipped-bit mask in extractParams is keyed by trie
depth, while buildBranch/nodeIndex consume it by buildBranch order. Align the
producer and consumer by using one consistent key: preferably record skipped
optional nodes in buildBranch order and update nodeIndex accordingly, or change
both sides to depth-based indexing; ensure skipping behavior remains correct
across optional traversal.

---

Outside diff comments:
In `@packages/router-core/src/new-process-route-tree.ts`:
- Around line 262-305: Update findSingleMatch to accept and pass
dynamicListsToSort into its parseSegments call, preserving the existing sorting
behavior for sibling dynamic segments in top-level flat routes.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 64521571-feff-4e63-b35e-f9342c940fb2

📥 Commits

Reviewing files that changed from the base of the PR and between 697ebb6 and fb90b1e.

📒 Files selected for processing (3)

• .changeset/faster-route-trees.md
• packages/router-core/src/new-process-route-tree.ts
• packages/router-core/tests/new-process-route-tree.test.ts

[nx-cloud]

View your CI Pipeline Execution ↗ for commit fb90b1e

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	11m 56s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	2m 6s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-08-06 11:06:15 UTC

[github-actions]

Bundle Size Benchmarks

• Commit: 9bfeb59af84f
• Measured at: 2026-08-06T10:51:47.156Z
• Baseline source: history:697ebb6ddbd4
• Dashboard: bundle-size history

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

Scenario	Current (gzip)	Delta vs baseline	Initial gzip	Raw	Brotli	Trend
react-router.minimal	87.00 KiB	-112 B (-0.13%)	86.86 KiB	268.05 KiB	75.67 KiB	████▃▃▃▃▃▃▃▁
react-router.full	90.76 KiB	-143 B (-0.15%)	90.62 KiB	280.00 KiB	79.04 KiB	████▅▅▅▅▅▄▄▁
solid-router.minimal	34.67 KiB	-129 B (-0.36%)	34.55 KiB	98.88 KiB	31.35 KiB	████▂▂▂▂▂▂▂▁
solid-router.full	39.76 KiB	-139 B (-0.34%)	39.64 KiB	114.06 KiB	35.84 KiB	████▃▃▃▃▃▂▂▁
vue-router.minimal	51.96 KiB	-135 B (-0.25%)	51.83 KiB	142.04 KiB	46.78 KiB	████▂▂▂▂▂▂▂▁
vue-router.full	57.90 KiB	-159 B (-0.27%)	57.77 KiB	160.71 KiB	51.95 KiB	████▂▂▂▂▂▂▂▁
react-start.minimal	100.47 KiB	-132 B (-0.13%)	100.33 KiB	311.19 KiB	87.24 KiB	███████▂▂▂▂▁
react-start.deferred-hydration	101.21 KiB	-131 B (-0.13%)	100.35 KiB	312.57 KiB	87.99 KiB	███████▂▂▂▂▁
react-start.full	103.80 KiB	-125 B (-0.12%)	103.66 KiB	321.14 KiB	90.08 KiB	███████▂▂▁▂▁
react-start.rsbuild.minimal	100.04 KiB	-197 B (-0.19%)	99.87 KiB	315.69 KiB	86.32 KiB	▁▁▁▁▂▂▂████▅
react-start.rsbuild.minimal-iife	100.46 KiB	-193 B (-0.19%)	100.29 KiB	316.63 KiB	86.63 KiB	▁▁▁▁▂▂▂████▆
react-start.rsbuild.full	103.37 KiB	-208 B (-0.20%)	103.19 KiB	325.78 KiB	89.05 KiB	▁▁▁▁▃▃▃████▆
solid-start.minimal	48.03 KiB	-152 B (-0.31%)	47.90 KiB	141.02 KiB	42.72 KiB	███████▂▂▂▂▁
solid-start.deferred-hydration	51.30 KiB	-147 B (-0.28%)	47.96 KiB	149.06 KiB	45.70 KiB	███████▂▂▂▂▁
solid-start.full	53.30 KiB	-138 B (-0.25%)	53.17 KiB	156.75 KiB	47.24 KiB	████▆▆▆▂▂▁▁▁
vue-start.minimal	68.81 KiB	-168 B (-0.24%)	68.68 KiB	194.03 KiB	61.21 KiB	████▆▆▆▂▂▂▂▁
vue-start.full	72.79 KiB	-140 B (-0.19%)	72.66 KiB	206.53 KiB	64.67 KiB	████▆▆▆▂▂▁▁▁

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.

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commit: fb90b1e

[codspeed-hq]

Merging this PR will regress 0 benchmarks

⚠️ 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

⚡ 9 improved benchmarks
❌ 4 (👁 4) regressed benchmarks
✅ 167 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	mem server server-fn-churn (vue)	4,147.3 KB	263.1 KB	×16
⚡	Memory	mem server error-paths unmatched (vue)	2,142.1 KB	479.4 KB	×4.5
⚡	Memory	mem server peak-large-page (react)	1,737.5 KB	953.4 KB	+82.23%
⚡	Memory	mem server error-paths redirect (solid)	388 KB	278.2 KB	+39.49%
⚡	Memory	mem server error-paths redirect (vue)	338.6 KB	293.5 KB	+15.37%
⚡	Memory	mem server error-paths not-found (react)	277.7 KB	255.5 KB	+8.66%
⚡	Simulation	ssr server-fn multipart (solid)	64.2 ms	61.3 ms	+4.64%
⚡	Simulation	ssr server-fn raw-stream (solid)	113.2 ms	108.5 ms	+4.3%
⚡	Simulation	ssr control-flow unmatched 404 (react)	58.1 ms	56.4 ms	+3%
👁	Memory	mem server error-paths not-found (solid)	415.1 KB	789.1 KB	-47.4%
👁	Simulation	ssr server-fn during document ssr (react)	62.9 ms	65.9 ms	-4.62%
👁	Memory	mem server error-paths redirect (react)	197 KB	203.7 KB	-3.31%
👁	Memory	mem server error-paths unmatched (react)	317.5 KB	492.1 KB	-35.49%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing codex/consolidate-route-tree-optimizations (fb90b1e) with main (697ebb6)}