1820031 - 9.17% perf_reftest_singletons scrollbar-styles-1.html (Windows) regression on Mon February 27 2023

Status: RESOLVED WONTFIX

(Core :: CSS Parsing and Computation, defect)

Description

[Andrej (:aglavic)]

Perfherder has detected a talos performance regression from push b8a8b74dbdd01cade5a6aa258ce75f922969b639. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)
9%	perf_reftest_singletons scrollbar-styles-1.html	windows10-64-shippable-qr	e10s fission stylo webrender	446.11 -> 487.04

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests. Please follow our guide to handling regression bugs and let us know your plans within 3 business days, or the offending patch(es) may be backed out in accordance with our regression policy.

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Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1818927

Comment 2

[Emilio Cobos Álvarez (:emilio)]

Looking at this but it doesn't seem super-concerning if other metrics are unaffected.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1818927

Comment 4

[Emilio Cobos Álvarez (:emilio)]

I'm gonna rewrite more of the scrollbars in bug 1824236, and bug 1824254 should avoid some overhead on windows too.