The pagespeed(Lighthouse) team built a tool that lets you compare two pagespeed tests.
To use it, you need to upload either a JSON or an HTML file.
Pagespeed doesn’t let you download your test. Use the built-in Lighthouse test on Chrome DevTools. Press F12, open the lighthouse tab, run a test, and save the JSON.
Upload the JSON to the Lighthouse Report Diff Tool, and compare them.
