ALT Landing of the Lighthouse Report Diff Tool. The UI has options drag-n-drop or select-from-disk two JSON or HTML reports. Or view an example.
ALT Primary diff view. Shows how the top-level scores have improved/regressed. And perf metrics. And summaries for each audit.
ALT Detail diff view on "First Contentful Paint", "Serve images in next-gen formats" and "Eliminate render-blocking resources" differences in timing, observed transfer size and potential savings are called out.
ALT Detail diff view of "Enable text compression" and "User Timing marks and measures". In user timing, you can see how the start time and duration of marks/measures have changed between the two.
ALT https://chrislueders.substack.com/p/master-the-art-of-design-systems