2005996 - 0.17% installer size (Windows) regression on Thu December 4 2025

Status: RESOLVED WONTFIX

(Testing :: Performance, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a build_metrics performance regression from push 155b1621d551346b9719055e5daa043d31e56ac3. 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)
0.17%	installer size	windows2012-32-shippable	nightly	112,421,975.42 -> 112,618,132.25

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

You can run all of these tests on try with ./mach try perf --alert 47761

The following documentation link provides more information about this command.

Comment 2

[Andrew McCreight [:mccr8]]

The installer size regression is expected and we're just going to accept it.