1947708 - 21.84 - 2.82% facebook-nav.groups FirstVisualChange / speedometer VueJS-TodoMVC + 23 more (Windows) regression on Tue February 4 2025

Status: RESOLVED WONTFIX

(Core :: Graphics: WebRender, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a browsertime performance regression from push 9d8b4c0b99ed4e5f39825c3c8890979ca64efdd8. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)	Performance Profiles
22%	facebook-nav.groups FirstVisualChange	windows11-64-shippable-qr	cold fission webrender	142.06 -> 173.08	Before/After
20%	speedometer Preact-TodoMVC/CompletingAllItems/Async	windows11-64-shippable-qr	fission webrender	2.48 -> 2.98
18%	speedometer VanillaJS-TodoMVC/Adding100Items/Async	windows11-64-shippable-qr	fission webrender	1.99 -> 2.34
13%	speedometer Preact-TodoMVC/CompletingAllItems	windows11-64-shippable-qr	fission webrender	3.42 -> 3.88
12%	speedometer VueJS-TodoMVC/CompletingAllItems/Async	windows11-64-shippable-qr	fission webrender	3.64 -> 4.09
9%	speedometer BackboneJS-TodoMVC/CompletingAllItems/Sync	windows11-64-shippable-qr	fission webrender	5.31 -> 5.80
8%	stylebench Nth pseudo classes/Adding classes - 2/Sync	windows11-64-shippable-qr	fission webrender	0.50 -> 0.54	Before/After
8%	speedometer VueJS-TodoMVC/CompletingAllItems	windows11-64-shippable-qr	fission webrender	4.44 -> 4.80
7%	speedometer BackboneJS-TodoMVC/CompletingAllItems	windows11-64-shippable-qr	fission webrender	7.41 -> 7.93
6%	speedometer Elm-TodoMVC/DeletingItems	windows11-64-shippable-qr	fission webrender	26.57 -> 28.28
...	...	...	...	...	...
4%	speedometer React-Redux-TodoMVC/DeletingItems/Sync	windows11-64-shippable-qr	fission webrender	33.92 -> 35.16
4%	speedometer EmberJS-TodoMVC/DeletingItems/Async	windows11-64-shippable-qr	fission webrender	0.44 -> 0.46
3%	speedometer Flight-TodoMVC/CompletingAllItems	windows11-64-shippable-qr	fission webrender	15.12 -> 15.64
3%	speedometer BackboneJS-TodoMVC	windows11-64-shippable-qr	fission webrender	28.75 -> 29.67
3%	speedometer VueJS-TodoMVC	windows11-64-shippable-qr	fission webrender	13.77 -> 14.16

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)	Performance Profiles
13%	speedometer VueJS-TodoMVC/DeletingAllItems/Sync	windows11-64-shippable-qr	fission webrender	1.17 -> 1.02
12%	speedometer Preact-TodoMVC/DeletingItems/Sync	windows11-64-shippable-qr	fission webrender	0.80 -> 0.71
9%	speedometer VueJS-TodoMVC/CompletingAllItems/Sync	windows11-64-shippable-qr	fission webrender	0.80 -> 0.72
9%	speedometer Vanilla-ES2015-Babel-Webpack-TodoMVC/DeletingItems/Async	windows11-64-shippable-qr	fission webrender	0.22 -> 0.20
7%	speedometer Preact-TodoMVC/DeletingItems	windows11-64-shippable-qr	fission webrender	1.86 -> 1.72
...	...	...	...	...	...
3%	speedometer React-TodoMVC/DeletingAllItems/Sync	windows11-64-shippable-qr	fission webrender	11.46 -> 11.11

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests. Please follow our guide to handling regression bugs and let us know your plans within 3 business days, or the patch(es) may be backed out in accordance with our regression policy.

If you need the profiling jobs you can trigger them yourself from treeherder job view or ask a sheriff to do that for you.

You can run all of these tests on try with ./mach try perf --alert 43670

The following documentation link provides more information about this command.

For more information on performance sheriffing please see our FAQ.

If you have any questions, please do not hesitate to reach out to [e-mail].

Comment 1

[Alex Finder]

This push was already backed out in revision e96db7f2fc84bf31d8081316be884a96496fecb6 as specified in the regressed by ticket. Closing this defect as WONTFIX.