Page Speed: Remove unused CSS

Removing or deferring style rules that are not used by a document avoid downloads unnecessary bytes and allow the browser to start rendering sooner.

recommends:

  • Remove any inline style blocks containing CSS that is not used by the current page.
  • Minify CSS.
  • If your site uses external CSS files shared among multiple pages, consider splitting them into smaller files containing rules for specific pages.
  • If a page references style rules that are not needed right at startup, put them in a separate .css file and defer loading of the file until the onload event is fired
  • If you use JavaScript to generate styles, be sure that those functions aren't called from pages that don't use those styles. This may require some refactoring of JS code.

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