Open Bug 2013685 Opened 10 hours ago

significant LCP regressions in ubuntu 24.04

Categories

(Testing :: Performance, task, P2)

Product:
Testing
Component:
Performance
Type:
task

Tracking

(Not tracked)

People

(Reporter: kshampur, Unassigned)

References

Details

https://perf.compare/compare-results?baseRev=aaee45121326f83b45e4ad60823118890b5aca4d&baseRepo=try&newRev=8cc107a427c3ff7e1b82d9fb86418df9b2a1bd37&newRepo=try&framework=13&test_version=student-t&filter_status=regression%2Cimprovement&sort=delta%7Cdesc

While testing the Ubuntu 18.04 → 24.04 upgrade patch, we observed that LCP element identification appears to have changed on yahoo-mail pageload tests. (and several other large changes)

before profile: https://share.firefox.dev/46ixbqm
after profile: https://share.firefox.dev/4rnuL24

It seems this might be a change in LCP element identification logic rather than a performance issue. Need to determine if this is related to broader LCP measurement accuracy issues though

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