1720260 - 8.59 - 5.31% facebook fcp / facebook loadtime + 7 more (Android) regression on Thu July 8 2021

Status: RESOLVED INCOMPLETE

(GeckoView :: General, defect, P2)

Description

[Florin Strugariu [:Bebe]]

Perfherder has detected a browsertime performance regression from push 9ce5267e4743811a714223c8c5b4f3263c4f5468. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

Ratio	Suite	Test	Platform	Options	Absolute values (old vs new)
9%	facebook	fcp	android-hw-p2-8-0-android-aarch64-shippable	warm	299.56 -> 325.29
8%	facebook	ContentfulSpeedIndex	android-hw-p2-8-0-android-aarch64-shippable	warm	423.75 -> 458.23
8%	facebook	dcf	android-hw-p2-8-0-android-aarch64-shippable	warm	288.81 -> 311.88
7%	facebook	fcp	android-hw-p2-8-0-android-aarch64-shippable	warm	304.69 -> 326.97
7%	facebook	fnbpaint	android-hw-p2-8-0-android-aarch64-shippable	warm	307.00 -> 329.38
7%	facebook	FirstVisualChange	android-hw-p2-8-0-android-aarch64-shippable	warm	333.38 -> 357.29
6%	facebook	PerceptualSpeedIndex	android-hw-p2-8-0-android-aarch64-shippable	warm	373.54 -> 397.38
6%	facebook	LastVisualChange	android-hw-p2-8-0-android-aarch64-shippable	warm	529.62 -> 559.10
5%	facebook	loadtime	android-hw-p2-8-0-android-aarch64-shippable	warm	680.31 -> 716.40

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

[[ex-Mozilla] Agi Sferro | :agi]

That commit is literally just removing code so I'm doubtful it's the cause of the regression. I'll try to see if I can figure out the actual regressing commit.