How to Audit Your CSS for Unused Rules and Reduce Load Time by 60%

Audit your CSS for unused rules to reduce load time by 60%. Unused CSS comes from framework defaults, dead features, responsive leftovers, third-party overrides, and duplicate declarations. Use Chrome DevTools or Puppeteer's CSS.coverage protocol to measure the unused byte ratio. If any file exceeds 60% unused bytes, prune it to improve performance.