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👀 Oh, that’s an interesting @webkit bug: #212757 – Performance degraded from 10th May after users migrated to iOS 13.4 or up on iPhone Mobile Safari: bugs.webkit.org/show_bug.cgi?id=212757. Personally I haven’t noticed it as a user, but it shows up in RUM data.Permalink On twitter.com
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This bug was resolved with trac.webkit.org/changeset/263092/webkit, turns out O(n^2) operations on media queries were the culprit. Good that this was caught through massively scaled RUM data. If only Apple could push the fix without an iOS update.On twitter.com