Estimates downloaded but unused code payload.
Checks if the page loads massive CSS or JS files where a large percentage of the code is never executed or applied.
Unused code bloats the page size, delays rendering, and consumes CPU time, severely hurting Core Web Vitals (LCP and INP).
Removing unused JS/CSS is one of the most effective ways to improve page speed and user experience.
Run a free audit to see how your site performs on Unused JavaScript/CSS Audit and 159 other checks.
Start Free AuditChecks if images use responsive techniques like srcset.
Checks if images have width and height attributes to prevent layout shift.
Checks for JavaScript errors in the browser console. (Note: In-dev check)
Measures the total size of the HTML document.