1853858 - 9.16 - 3.75% facebook LastVisualChange / yahoo-mail SpeedIndex + 1 more (Linux) regression on Thu September 14 2023

Status: NEW

(Core :: Widget: Gtk, defect)

Description

[Alexandru Ionescu (needinfo me) [:alexandrui]]

Perfherder has detected a browsertime performance regression from push 890cdd99877113f78366cea8477d27bf5511781d. 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
9%	facebook LastVisualChange	linux1804-64-shippable-qr	fission warm webrender	892.11 -> 973.81	Before/After
5%	youtube SpeedIndex	linux1804-64-shippable-qr	fission warm webrender	1,198.71 -> 1,252.77	Before/After
4%	yahoo-mail SpeedIndex	linux1804-64-shippable-qr	fission warm webrender	194.67 -> 201.97	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 offending patch(es) may be backed out in accordance with our regression policy.

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Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1852084

Comment 2

[Emilio Cobos Álvarez (:emilio)]

The push seems wrong? Or the regressing bug seems wrong alternatively?

Comment 3

[Donal Meehan [:dmeehan]]

Setting Fx119 to fixed, the regressor was backed out
https://bugzilla.mozilla.org/show_bug.cgi?id=1852084#c13

Comment 4

[Alexandru Ionescu (needinfo me) [:alexandrui]]

(In reply to Emilio Cobos Álvarez (:emilio) from comment #2)

The push seems wrong? Or the regressing bug seems wrong alternatively?

Hi :emilio, I updated the description of the regression bug with the right revision that caused it. Sorry for the confusion!

Comment 5

[Emilio Cobos Álvarez (:emilio)]

So the only thing that could potentially regress this is the border-radius, because if using -moz-appearance is faster somehow than a solid color then well :)

That border radius was already used when the user had a theme installed...