⚡ Bolt: optimize scroll performance and reduce redundant re-renders#13
⚡ Bolt: optimize scroll performance and reduce redundant re-renders#13VagueDustin wants to merge 1 commit into
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This commit implements several performance optimizations in the main App component:
- Replaces `scrollProgress` state with `progressBarRef` and direct DOM manipulation to eliminate component-wide re-renders during scrolling.
- Throttles the scroll handler using `requestAnimationFrame` and adds `{ passive: true }` to the listener for smoother interactions.
- Uses `activeHeadingRef` to ensure `setActiveHeading` state updates only occur when the active heading actually changes.
- Converts `filePath` state to a ref as it was only used for logic and not rendering.
- Resolves linting errors related to unused variables, redundant React imports, and control characters in regex.
- Improves robustness by adding a check for `totalScrollable > 0` before calculating progress.
Co-authored-by: VagueDustin <127912586+VagueDustin@users.noreply.github.com>
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💡 What: Optimized the scroll performance by bypassing React's reconciliation for the scroll progress bar and throttling the scroll handler with
requestAnimationFrame. Also converted internal logic state (filePath) to refs to eliminate redundant re-renders.🎯 Why: High-frequency scroll events were triggering full-component re-renders (including complex Markdown rendering) on every tick, causing significant main-thread overhead and potential lag in large documents.
📊 Impact: Reduces re-renders during scrolling from ~60-120 per second to nearly zero for the progress bar, and strictly throttles TOC highlighting updates to only when necessary.
🔬 Measurement: Verified using
npm run buildandnpm run lint. Visual consistency confirmed via Playwright screenshots. Performance gains visible in React DevTools by observing reduced render counts during scroll.PR created automatically by Jules for task 2484177564918365908 started by @VagueDustin