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CSS can speed a site up or slow it down. Critical CSS inline in the head, lazy loading the rest, content-visibility for invisible sections. On the other hand a huge bundle of styles from a design system that blocks rendering. Details decide.

Under the CSS tag you will find articles on splitting critical and deferred CSS, using content-visibility and contain, and the impact of the utility-first approach (Tailwind, UnoCSS) on speed.

Test: Is It Better to Have Many Small CSS Files or One Large One?

At PageSpeed.ONE, we often find ourselves in "evergreen" discussions that divide the team. One perennial question is: Is it faster to have many small CSS files divided by components, or one large file?

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