
CSS Performance Analysis ToolsĪdmitting you have a CSS performance problem is the first step on the road to recovery! Finding and fixing the causes is another matter. Some properties, such as shadows and gradients, are also computationally more expensive than block colors and margins. If you’re not careful, CSS property changes and animations can cause all three phases to re-render.

It can be difficult to identify styles that are no longer used, and removing the wrong ones can wreak havoc on a site.

Although CSS stylesheets are smaller than most other website files, they’re not immune from the “smaller is better” rule of thumb.
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The larger your stylesheet, the longer it takes to download and process into a CSS Object Model (CSSOM), which the browser and JavaScript APIs can use to display the page. Want to improve your site's performance? 🚀Start with CSS 💥 Click to Tweet Large CSS Files Take Time to Process The file is cached, so subsequent page loads should be faster, but the render-blocking process remains.

The defer attribute to download in parallel, then run in order when the DOM is ready.The async attribute to download scripts in parallel, which are run immediately they are ready.JavaScript can also block browser rendering, but asynchronous processing is possible with: When your browser encounters a tag, it halts other browser downloads and processing while fetching and parsing the CSS file. CSS looks innocent but can require some heavy processing.
