Use this guide when visitors complain your site is slow or a performance report scores poorly. Have access to the site's code or content management system and a browser with developer tools.
Step by step
Measure a baseline
Run a performance test on your slowest important page using your browser's built-in Lighthouse or performance panel. Note the key measures, such as Largest Contentful Paint and total page weight, and save the report. Test on a simulated mobile connection, as that is how many people visit.
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