![]() If you have poor First Contentful Paint (FCP) and see "Eliminate render-blocking resource" opportunity in Lighthouse audits it's a good idea to give critical CSS a go. ![]() On mobile networks, high latency is an issue regardless of bandwidth.Ĭomparison of loading a page with render-blocking CSS (top) and the same page with inlined critical CSS (bottom) on a 3G connection Improving render times can make a huge difference in perceived performance, especially under poor network conditions. ![]() The remainder of the CSS can be loaded asynchronously. Inlining extracted styles in the of the HTML document eliminates the need to make an additional request to fetch these styles. There is no universally defined pixel height of what is considered above the fold content since there is a myriad of devices and screen sizes. Note: Above-the-fold is all the content a viewer sees on page load, before scrolling. Key term: Critical CSS is a technique that extracts the CSS for above-the-fold content in order to render content to the user as fast as possible. If CSS files are big, or network conditions are poor, requests for CSS files can significantly increase the time it takes for a web page to render. The browser must download and parse CSS files before it can show the page, which makes CSS a render-blocking resource. ![]()
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