Computer Tricks and Secrets

Short answer: unused CSS bloats your stylesheet and slows page loads. To fix it, find what is actually used with Chrome DevTools' Coverage tool, then remove the dead rules manually or automatically with a tool like PurgeCSS, and always test afterward. Here is the safe process, especially important if you use a big framework like Bootstrap. Why unused CSS matters Frameworks and themes ship huge stylesheets, but a typical page uses only a fraction of the rules. The browser still downloads and parses all of it, delaying rendering. Trimming unused CSS shrinks the file and speeds up load, a real Core Web Vitals win. Step 1: See how much CSS is unused Open your page in Chrome and press F12 for DevTools. Open the Coverage tab (Ctrl+Shift+P, type "Coverage"). Click reload; it shows each CSS file with the percentage of unused bytes, often shockingly high. This tells you how much you can save and which files to target. Step 2: Remove the unused rules Automatically...