This article covers CSS-related techniques for optimizing Web Vitals.

Learn the most common speed issues caused by CSS and how to avoid them.

Looking at data for some of the most popular websites, we repeat ourselves too much in CSS; using declarations just once is often one solid avenue to avoid repetition; together, we need to put more focus on style sheet optimization.

Painting an unstyled page, and then repainting it once styles are parsed would be bad user experience. For this reason, CSS is render blocking, unless the browser knows the CSS is not currently needed. The browser can paint the page once it has downloaded the CSS and built the CSS object model. Browsers follow a specific rendering path: paint only occurs after layout, which occurs after the render tree is created, with requires both the DOM and the CSSOM trees. To optimize the CSSOM construction, remove unnecessary styles, minify, compress and cache it, and split CSS not required at page lo...

Unused CSS is an online tool to remove unused CSS rules. It will check your pages, find unused CSS and let you download a clean CSS file.

Learn how to hasten page rendering by cutting the excess from your site's CSS.