1981538 - 0.06% Base Content Explicit (Windows) regression on Wed July 30 2025

Status: RESOLVED DUPLICATE of bug 1981540

(Core :: CSS Parsing and Computation, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a awsy performance regression from push 229f3f836fa13a024fc7793bff06ac4db410d698. 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)
0.06%	Base Content Explicit	windows11-64-24h2-shippable	fission	8,200,421.33 -> 8,205,152.00

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 46135

The following documentation link provides more information about this command.

Comment 1

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

Set release status flags based on info from the regressing bug 1954142

Comment 2

[Keith Cirkel [:keithamus]]

This seems to be a dupe of https://bugzilla.mozilla.org/show_bug.cgi?id=1981540, in essence.