1765183 - 2.29% welcome PerceptualSpeedIndex (OSX) regression on Sat April 2 2022

Status: RESOLVED DUPLICATE of bug 1763666

(Firefox :: Messaging System, defect)

Description

[Alex Finder]

Perfherder has detected a browsertime performance regression from push 6dd62bffb5c1d84d013f5f273a022912314ce0ea. 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)
2%	welcome PerceptualSpeedIndex	macosx1015-64-shippable-qr	fission warm webrender	1,286.17 -> 1,315.67

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
9%	welcome ContentfulSpeedIndex	macosx1015-64-shippable-qr	cold fission webrender	1,942.00 -> 1,775.92
7%	welcome ContentfulSpeedIndex	macosx1015-64-shippable-qr	fission warm webrender	1,822.58 -> 1,686.33

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) will be backed out in accordance with our regression policy.

For more information on performance sheriffing please see our FAQ.

Comment 1

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

Set release status flags based on info from the regressing bug 1762292

Comment 3

[Emily McMinn :emcminn]

All of these changes to about:welcome for Fx100 will be reverted for 101; this is the same stack referenced here: https://bugzilla.mozilla.org/show_bug.cgi?id=1763666#c2.