perf(ids): optimize deterministic module id assignment

[LingyuCoder]

Summary

• precompute the webpack-compatible FNV prefix state in the existing parallel full-module-name pass
• cache module pre-order indices before sorting instead of looking them up from the module graph in every comparison
• reserve the module ID collections and materialize each numeric ModuleId only once
• preserve the existing range selection, UTF-16 hashing, salt, collision retry, and deterministic ordering behavior

On the React 10k production fixture with a warm persistent cache:

• DeterministicModuleIdsPlugin: 11.905 ms -> 6.490 ms median (45.5% reduction)
• complete module ids pass: 12.340 ms -> 7.646 ms median (38.0% reduction)
• all 19 cold-build output file names and SHA-256 hashes are unchanged

Related links

N/A

Testing

• cargo test -p rspack_util number_hash
• cargo check -p rspack_util -p rspack_ids
• pnpm run build:binding:dev
• pnpm run test:unit (9158 passed, 4 skipped; CLI 90 passed, 1 skipped)

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[chatgpt-codex-connector]

Codex Review Summary

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

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-29T15:29:53.609125Z	0dd4dcf	PR opened

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[github-actions]

📦 Binary Size-limit

Comparing 0dd4dcf to chore(deps): update dependency @module-federation/runtime-tools to v2.9.0 (#15386) by renovate[bot]

🎉 Size decreased by 4.00KB from 68.30MB to 68.30MB (⬇️0.01%)

[codspeed-hq]

Merging this PR will improve performance by 49.28%

⚠️ 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

⚡ 1 improved benchmark
✅ 49 untouched benchmarks
⏩ 47 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	rust@create_module_ids	4.9 ms	3.3 ms	+49.28%

Tip

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

---

_{Comparing seal/profile-create-hash-react10k (0dd4dcf) with main (a68bb1e)}

Footnotes

1. 47 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

Rsdoctor Bundle Diff Analysis

⚠️ Note: The latest commit (a68bb1eace) does not have baseline artifacts. Using commit 83b0da838b for baseline comparison instead. If this seems incorrect, please wait a few minutes and try rerunning the workflow.

Found 5 projects in monorepo, 0 projects with changes.

📊 Quick Summary

Project	Total Size	Gzip Size	Change	Gzip Change
popular-libs	1.7 MB	556.5 KB	0	0
react-10k	5.6 MB	1.3 MB	0	0
react-5k	2.7 MB	669.3 KB	0	0
react-1k	823.1 KB	218.4 KB	0	0
ui-components	4.9 MB	1.4 MB	0	0

Generated by Rsdoctor GitHub Action

[chenjiahan]

👍