1832365 - Enable background browsing context mainthreads for all of Nightly

Status: RESOLVED FIXED

(Core :: XPCOM, enhancement)

Description

[Kris Wright :KrisWright]

Preliminary testing shows that we are getting noticeable power savings per tab put in the background with the pref on. Ahead of doing a release experiment, we want to enable this for all of Nightly to look for any edge-case performance or usage issues. As of right now, it appears ~30% of our MacOS users are using apple silicon and will benefit from the change.

Comment 1

[Kris Wright :KrisWright]

Attachment: Bug 1832365 - Enable threads.lower_mainthread_priority_in_background.enabled for nightly users (mac only) r?#xpcom-reviewers

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/f9836204ac87
Enable threads.lower_mainthread_priority_in_background.enabled for nightly users (mac only) r=xpcom-reviewers,nika

Comment 3

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/f9836204ac87

Comment 4

[Florian Quèze [:florian]]

Should we back out this pref change until bug 1834629 is fixed? I recently saw a 14+s tab switch while building Firefox (https://share.firefox.dev/43AVyvN). I assume other Firefox developers using Macs have similar issues.