perf(cli): Enable Node.js module compile cache for faster startup#1181
perf(cli): Enable Node.js module compile cache for faster startup#1181
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Enable V8 compile cache via module.enableCompileCache() to speed up CLI startup by caching compiled bytecode across runs. Benchmarks show ~10% improvement in startup time (148ms vs 165ms). Available on Node.js >= 22.8.0, gracefully skipped on older versions. Can be disabled via NODE_DISABLE_COMPILE_CACHE env var.
Summary of ChangesHello @yamadashy, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request implements a significant performance optimization for the CLI by activating the Node.js module compile cache. By leveraging V8's ability to cache compiled JavaScript bytecode, the change aims to reduce application startup times, providing a faster and more efficient user experience without introducing any regressions or requiring user configuration. Highlights
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📝 WalkthroughWalkthroughA Node.js compile cache enablement block is added to the entry point. The code conditionally enables the compile cache feature by checking for module availability and environment configuration before the existing startup logic executes. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Possibly related PRs
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Code Review
This pull request introduces a performance improvement by enabling the Node.js module compile cache, which should speed up CLI startup. The implementation is sound, with checks for feature availability and an option to disable it via an environment variable. My only suggestion is to enhance debuggability by logging any errors encountered when enabling the cache, but only in verbose mode to avoid unnecessary output for users.
| } catch { | ||
| // Ignore errors | ||
| } |
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Silently ignoring errors in the catch block can make debugging difficult if enableCompileCache() fails for an unexpected reason (e.g., file system permissions). While this feature is a non-critical performance optimization, it would be beneficial to log the error when in verbose mode. This provides visibility for debugging why the cache isn't working, without adding noise for regular users.
} catch (error) {
if (process.argv.includes('--verbose')) {
console.warn('Warning: Failed to enable Node.js compile cache:', error);
}
}
Deploying repomix with
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| Branch Preview URL: | https://perf-enable-compile-cache.repomix.pages.dev |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #1181 +/- ##
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Coverage 87.14% 87.14%
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Files 115 115
Lines 4310 4310
Branches 998 998
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Hits 3756 3756
Misses 554 554 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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Code Review — PR #1181perf(cli): Enable Node.js module compile cache for faster startup Overall AssessmentClean, minimal change that enables V8 compile cache for ~10% startup improvement with no downside. The implementation is well-guarded with feature detection and error handling. Looks good to merge. ObservationsStrengths:
Minor Suggestion (non-blocking)Redundant The explicit That said, the explicit check does make the intent clearer to readers and avoids even calling the function unnecessarily, so keeping it is perfectly fine. It's a matter of style preference. Premortem Analysis
CI StatusAll Linux and most cross-platform checks are passing. Some Windows and macOS jobs are still in progress but the completed ones (including Windows Node 25.x, macOS Node 22.x) passed successfully. VerdictLGTM. The change is minimal, well-guarded, and provides a measurable improvement. No blocking issues. |
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1 participant
Enable V8 compile cache via
module.enableCompileCache()in the CLI entry point to speed up startup by caching compiled bytecode across runs.NODE_DISABLE_COMPILE_CACHEenv var--version, 50 runs each, sequential):~10% startup improvement with zero downside.
Reference: https://nodejs.org/api/module.html#module-compile-cache
Checklist
npm run testnpm run lint