CSS file too large

Bloated CSS blocks rendering and ships rules the page never uses.

What it is

This check flags stylesheets whose transferred size exceeds a healthy budget.

Why it matters for SEO

Large render-blocking CSS delays first paint and Largest Contentful Paint, hurting Core Web Vitals.

Example

styles.css - 420 KB (much unused)

How to fix

1. Remove unused CSS (purge/tree-shake) and split by route.
2. Inline critical CSS and defer the rest.
3. Minify and serve compressed.
4. Re-crawl to confirm CSS weight dropped.

Related checks

• Page has broken CSS
• Page has redirected CSS

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