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refactored the `.scroll-progress` bar in `styles.css` and `script.js` to use `transform: scaleX(...)` instead of modifying `width`. this leverages hardware acceleration to animate layout updates smoothly, effectively eliminating layout thrashing and forced synchronous repaints during scrolling.
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💡 what: replaced the
widthupdates of the scroll progress bar with a csstransform: scaleX(...)manipulation.🎯 why: directly altering the
widthof a DOM element on every scroll event forces the browser to recalculate the layout and repaint the screen continuously, leading to layout thrashing and performance degradation, particularly on mobile devices.📊 impact: significantly reduces cpu overhead during scrolling by offloading the progress bar animation to the gpu compositor thread. this ensures a silky-smooth scroll experience even on underpowered devices.
🔬 measurement: run the local dev server and test scrolling. open chrome dev tools -> performance -> record a scroll. observe that there are fewer 'recalculate style' and 'layout' events triggered by the scroll progress bar.
PR created automatically by Jules for task 842251853814103062 started by @dttdrv