2015096 - 9.39 - 9.2% twinopen ext+twinopen:twinopen.html / twinopen ext+twinopen:twinopen.html (Linux) regression on Tue January 27 2026

Status: RESOLVED WONTFIX

(Core :: Widget: Gtk, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a talos performance regression from push ab56c3406371a089dbc3ad9b769cef156c8d82dd. 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.

Regression	Test	Platform	Options	Absolute values [old vs new]
9%	twinopen ext+twinopen:twinopen.html (doc)	linux1804-64-shippable-qr	e10s fission stylo webrender-sw	144.03 ms -> 157.55 ms
9%	twinopen ext+twinopen:twinopen.html (doc)	linux1804-64-shippable-qr	e10s fission stylo webrender	150.92 ms -> 164.81 ms

Support & Actionable Steps

For questions, please contact [e-mail]. You can also find help on Slack (#perf-help) or Matrix (#perftest).

Action guide details:

• See the guide to handling regression bugs for investigation steps.
• Review the alert summary for affected tests, graphs, and comparisons.
• Check the PerfCompare results.
• Tests on Try: Run all tests using ./mach try perf --alert 48335 (See documentation link for details).
• Profiling jobs: Trigger jobs from Treeherder job view or request them from [e-mail].

Comment 1

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

Set release status flags based on info from the regressing bug 2009891

Comment 2

[Martin Stránský [:stransky] (ni? me)]

It's expected - we reverted Bug 2001628 for X11 -that one causes the performance gain. So we see the regression now. But it's not actual regression, we juts removed the improvement (Bug 2001628) for X11.