⚡ bolt: [performance improvement]#15
Conversation
- optimized `.scroll-progress` bar animation.
- used `transform: scaleX` instead of `width`.
- layout calculation happens once, compositing is hardware accelerated.
- documented learning in `.jules/bolt.md`.
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Pull request overview
This PR improves scroll performance by changing the scroll progress indicator from a layout-affecting width animation to a compositor-friendly transform: scaleX animation, reducing reflow work during scrolling.
Changes:
- Updated
.scroll-progressstyling to usewidth: 100%withtransform: scaleX(...)andtransform-origin: left. - Updated the scroll progress JS to compute progress as a 0..1 ratio and apply it via
style.transform. - Refreshed the internal bolt note to document the rationale for the optimization.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| styles.css | Switches the progress bar from animating width to animating transform for better scroll performance. |
| script.js | Updates scroll progress calculations and DOM updates to drive scaleX() (0..1) instead of percent widths. |
| .jules/bolt.md | Documents the learning/action behind the scroll progress performance change. |
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💡 What: optimized
.scroll-progressbar animation by usingtransform: scaleXinstead ofwidth.🎯 Why: animating
widthcauses layout thrashing because it triggers a layout recalculation on every frame during scrolling.📊 Impact: eliminates layout recalculation during scrolling, reducing jank and improving scrolling performance.
🔬 Measurement: verify that the progress bar animates smoothly during scroll and check browser dev tools for layout calculations.
PR created automatically by Jules for task 10341486672454101574 started by @dttdrv