![]() Both PageSpeed Insights and GTmetrix are free web apps that use the Lighthouse library to measure page speed, Core Web Vitals, and other performance metrics. The most notable ones are Lighthouse, which is now part of Chrome DevTools, PageSpeed Insights, and GTmetrix. Luckily, these days there are many free performance metrics tools you can use for this purpose. Whether you have an existing website or it’s still in the development phase, the first thing to do is find your render blocking resources so that you can decide how to handle them. Now let’s zoom in on nine strategies to eliminate or reduce the number and impact of render blocking resources. Images, media files, and tags placed at the bottom of the section are treated as non-render blocking resources. HTML imports (even though HTML imports are now obsolete, you might still encounter them on legacy pages). ![]() Fonts added from either CDN or a local server.Types of render blocking resourcesĪs a rule of thumb, the browser treats everything it finds in the section of an HTML page as render blocking. So, for a better LCP score, it’s recommended to keep the number and weight of your render blocking resources in check. If your critical rendering path is too long (you have too many render blocking resources, or the files are too large), the largest content element will take longer to load. ![]() LCP measures the rendering time of the largest image or text block that’s visible in the user’s viewport. Render blocking resources can negatively impact one of the three Core Web Vitals: the Largest Contentful Paint (LCP). Render blocking resources and Core Web VitalsĮven though the elimination of render blocking resources has always been an important performance optimization technique, the introduction of Core Web Vitals, Google’s new performance metrics, has made it even more important.Īs Core Web Vitals are included in Google’s search algorithm, you simply can’t ignore them if you want your site to rank high in Google.
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