<ul data-eligibleForWebStory="true"><li>Your choice of CSS unit can impact your application's performance by affecting animations and screen refresh rates.</li><li>Throughput in frontend refers to the browser's capability to accomplish work per second, including measuring, painting elements, layout changes, and animations.</li><li>Units like px, em/rem, %, vw/vh, and fr have different advantages and disadvantages that can impact throughput.</li><li>Practical cases demonstrate how poorly chosen units, like using em for animations on nested elements, can slow down rendering.</li><li>Best practices suggest using px or rem for animations, avoiding % and vw/vh for elements with high update frequency, and being cautious with em in deeply nested structures.</li><li>Using 'will-change' CSS property can optimize animated elements by hinting to the browser about the properties that will change.</li><li>Choosing the right CSS unit is crucial for optimizing web application performance, leading to smoother animations, faster rendering, and improved user experience.</li></ul>

CSS Units Are Slowing Down Your Website - Here’s How to Fix It!

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