1932867 - 1577.61 - 3.92% google-slides largestContentfulPaint / bing-search PerceptualSpeedIndex + 16 more (Windows) regression on Sat November 16 2024

Status: RESOLVED FIXED

(Core :: Widget: Win32, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a browsertime performance regression from push 1893713e1d17f24aee75b0193a03d227cb8c07b4. 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
1578%	google-slides largestContentfulPaint	windows11-64-shippable-qr	fission warm webrender	62.89 -> 1,055.01	Before/After
1373%	google-slides largestContentfulPaint	windows11-64-shippable-qr	fission warm webrender	66.05 -> 972.73	Before/After
414%	imdb ContentfulSpeedIndex	windows11-64-shippable-qr	cold fission webrender	422.75 -> 2,171.79	Before/After
406%	imdb LastVisualChange	windows11-64-shippable-qr	fission warm webrender	1,142.55 -> 5,782.49	Before/After
342%	imdb PerceptualSpeedIndex	windows11-64-shippable-qr	fission warm webrender	201.24 -> 890.37	Before/After
341%	imdb SpeedIndex	windows11-64-shippable-qr	fission warm webrender	196.67 -> 866.59	Before/After
269%	imdb ContentfulSpeedIndex	windows11-64-shippable-qr	fission warm webrender	207.66 -> 766.00	Before/After
199%	imdb LastVisualChange	windows11-64-shippable-qr	cold fission webrender	2,138.49 -> 6,401.68	Before/After
182%	imdb PerceptualSpeedIndex	windows11-64-shippable-qr	cold fission webrender	419.18 -> 1,181.71	Before/After
107%	imdb SpeedIndex	windows11-64-shippable-qr	cold fission webrender	431.12 -> 890.33	Before/After
...	...	...	...	...	...
7%	expedia SpeedIndex	windows11-64-shippable-qr	cold fission webrender	500.08 -> 537.45	Before/After
7%	speedometer3 TodoMVC-Svelte-Complex-DOM/DeletingAllItems/Sync	windows11-64-shippable-qr	fission webrender	1.05 -> 1.12	Before/After
7%	google-slides ContentfulSpeedIndex	windows11-64-shippable-qr	fission warm webrender	698.50 -> 744.08	Before/After
5%	speedometer3 TodoMVC-Preact-Complex-DOM/CompletingAllItems/Sync	windows11-64-shippable-qr	fission webrender	1.42 -> 1.49	Before/After
4%	bing-search PerceptualSpeedIndex	windows11-64-shippable-qr	bytecode-cached fission warm webrender	316.12 -> 328.50	Before/After

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)	Performance Profiles
26%	wikipedia LastVisualChange	windows11-64-shippable-qr	fission warm webrender	575.82 -> 423.68	Before/After
25%	wikipedia LastVisualChange	windows11-64-shippable-qr	cold fission webrender	1,033.31 -> 776.30	Before/After
13%	instagram ContentfulSpeedIndex	windows11-64-shippable-qr	cold fission webrender	324.38 -> 281.88	Before/After
11%	wikipedia loadtime	windows11-64-shippable-qr	fission warm webrender	250.12 -> 223.01	Before/After
6%	youtube ContentfulSpeedIndex	windows11-64-shippable-qr	cold fission webrender	831.27 -> 783.48	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. 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 42760

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

[Acasandrei Beatrice (needinfo me)]

The changes have been backedout, and this bug can be closed. No further action is required from the author.

Comment 2

[Emilio Cobos Álvarez [:emilio]]

Yes, indeed, fixed by backout.