1994215 - 2.28 - 0.18% installer size / installer size + 2 more (Windows) regression on Mon October 6 2025

Status: RESOLVED WONTFIX

(Core :: Widget: Win32, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a build_metrics performance regression from push 53aa44de71d67d208a00cae329749c3738cda7ac. 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)
2%	installer size	windows2012-32-shippable	nightly	109,037,667.67 -> 111,519,792.92
2%	installer size	win64-nightlyasrelease	nightly nightly-as-release	125,289,884.58 -> 127,652,885.83
0.25%	installer size	osx-shippable	nightly	112,643,668.08 -> 112,926,839.17
0.19%	installer size	windows2012-64-shippable	nightly	130,275,471.83 -> 130,522,605.75
0.18%	installer size	windows2012-64-shippable	nightly	130,264,382.67 -> 130,502,686.17

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 47061

The following documentation link provides more information about this command.

Comment 1

[Greg Stoll :gstoll]

The regressions on Windows are due to the inclusion of DLLs from the Windows App SDK, which is necessary to fix bug 1947324 and eventually enable Mica support.

(the regression on OSX is likely spurious)