1852880 - 11.05% amazon loadtime (Linux) regression on Wed September 6 2023

Status: RESOLVED WONTFIX

(Core :: Layout, defect)

Description

[Alex Finder]

Perfherder has detected a browsertime performance regression from push e43370e4259f61e0c264dbcef8b45e2862b3c5e8. 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
11%	amazon loadtime	linux1804-64-shippable-qr	fission warm webrender	423.94 -> 470.81	Before/After

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)	Performance Profiles
8%	reddit-billgates-post-1.posts ContentfulSpeedIndex	linux1804-64-shippable-qr	cold fission webrender	234.02 -> 214.16
4%	yahoo-mail SpeedIndex	linux1804-64-shippable-qr	cold fission webrender	346.84 -> 334.27	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.

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

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 1847929

Comment 2

[Emilio Cobos Álvarez [:emilio]]

Improvements are better than regressions there. Amazon probably has an out-of-process iframe blocking the load event.