2004056 - 18.21 - 6.76% jetstream3 gaussian-blur-First / jetstream3 gaussian-blur-Average + 12 more (Android, Linux, OSX, Windows) regression on Thu November 27 2025

Status: NEW

(Core :: JavaScript Engine: JIT, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a browsertime performance regression from push 16e80f9541a46f1a656e5b47a3649352b6c9dba6. 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)	Performance Profiles
18%	jetstream3 gaussian-blur-First	linux1804-64-shippable-qr	fission webrender	19.68 -> 23.27	Before/After
14%	jetstream3 crypto-Average	android-hw-a55-14-0-aarch64-shippable	fission webrender	7.20 -> 8.20
14%	jetstream3 crypto-Worst	android-hw-a55-14-0-aarch64-shippable	fission webrender	8.18 -> 9.30
13%	jetstream3 crypto-Average	android-hw-a55-14-0-aarch64-shippable	webrender	7.21 -> 8.14
12%	jetstream3 crypto-Geometric	android-hw-a55-14-0-aarch64-shippable	fission webrender	564.92 -> 497.95
11%	jetstream3 crypto-Worst	android-hw-a55-14-0-aarch64-shippable	webrender	8.23 -> 9.18
10%	jetstream3 crypto-Average	macosx1500-aarch64-shippable	fission webrender	2.39 -> 2.63	Before/After
9%	jetstream3 crypto-Geometric	android-hw-a55-14-0-aarch64-shippable	webrender	563.91 -> 511.65
9%	jetstream3 crypto-Worst	macosx1500-aarch64-shippable	fission webrender	2.56 -> 2.79	Before/After
9%	jetstream3 gaussian-blur-First	android-hw-a55-14-0-aarch64-shippable	webrender	19.14 -> 20.85
8%	jetstream3 gaussian-blur-Geometric	linux1804-64-shippable-qr	fission webrender	292.25 -> 268.51	Before/After
8%	jetstream3 crypto-Geometric	macosx1500-aarch64-shippable	fission webrender	1,789.41 -> 1,649.26	Before/After
7%	jetstream3 crypto-First	macosx1500-aarch64-shippable	fission webrender	3.56 -> 3.80	Before/After
7%	jetstream3 gaussian-blur-Average	windows11-64-24h2-shippable	fission webrender	8.13 -> 8.68	Before/After

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)	Performance Profiles
21%	jetstream3 babylon-wtb-Average	android-hw-a55-14-0-aarch64-shippable	fission webrender	234.44 -> 185.23
20%	jetstream3 babylon-wtb-Geometric	android-hw-a55-14-0-aarch64-shippable	fission webrender	18.26 -> 21.92
17%	jetstream3 gaussian-blur-Worst	macosx1500-aarch64-shippable	fission webrender	6.06 -> 5.01	Before/After
17%	jetstream3 gaussian-blur-Geometric	macosx1500-aarch64-shippable	fission webrender	816.35 -> 952.12	Before/After
16%	jetstream3 gaussian-blur-Average	macosx1500-aarch64-shippable	fission webrender	5.87 -> 4.90	Before/After

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 47726

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 998485

Comment 2

[wilsu]

Seen, working on it.