1972993 - 62.15 - 6.69% tp5o_scroll_paint_skip / displaylist_mutate + 3 more (Windows) regression on Tue June 10 2025

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a talos performance regression from push 476bf3a723b14b30f682b928d3375d3ec79f08c5. As author of one of the patches included in that push, we need your help to address this regression.

Please acknowledge, and begin investigating this alert within 3 business days, or the patch(es) may be backed out in accordance with our regression policy. Our guide to handling regression bugs has information about how you can proceed with this investigation.

If you have any questions or need any help with the investigation, please reach out to [e-mail]. Alternatively, you can find help on Slack by joining #perf-help, and on Matrix you can find help by joining #perftest.

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)
62%	tp5o_scroll_paint_skip	windows11-64-24h2-shippable	e10s fission stylo webrender	0.45 -> 0.73
42%	tp5o_scroll	windows11-64-24h2-shippable	e10s fission stylo webrender	1.04 -> 1.48
32%	tscrollx_paint_skip	windows11-64-24h2-shippable	e10s fission stylo webrender	0.16 -> 0.21
10%	tart	windows11-64-24h2-shippable	e10s fission stylo webrender	1.76 -> 1.94
7%	displaylist_mutate	windows11-64-24h2-shippable	e10s fission stylo webrender	1,312.47 -> 1,400.33

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests.

If you need the profiling jobs you can trigger them yourself from treeherder job view or ask [e-mail] to do that for you.

You can run all of these tests on try with ./mach try perf --alert 45508

The following documentation link provides more information about this command.

Comment 1

[Sotaro Ikeda [:sotaro]]

Bug 1945683 is already backed out.