1725178 - Worse CPU usage on twitch than Edge/Chrome

Status: NEW

(Core :: Performance, defect, P3)

Description

[Jeff Muizelaar [:jrmuizel]]

I've seen complaints about this reported on reddit.com a couple of times.
Here's a recent example:
https://www.reddit.com/r/firefox/comments/p2bfy3/firefox_is_using_absurd_amount_of_cpu_causing/

Comment 1

[Jeff Muizelaar [:jrmuizel]]

Here's another report: https://www.reddit.com/r/firefox/comments/onjc4n/twitch_sucks_in_firefox/h65pbx2/

Locally, the total CPU usage in I see is overall pretty low (7-11%) but it's often about double what Edge is using.

Comment 2

[Jeff Muizelaar [:jrmuizel]]

I took a profile with both Chrome and Firefox running at the same time. Using perfview I get a breakdown that looks like:

40.2%   firefox -contentproc  tab
18.5%   chrome --type=renderer   
17.1%   firefox -contentproc gpu 
 9.7%   chrome --type=gpu-process
 9.0%   firefox main             
 2.0%   chrome --type=utility    
 1.5%   firefox -contentproc  rdd
 1.3%   chrome main

Firefox is pretty obviously worse in all processes.

Comment 3

[djbystedt]

I am also experiencing this bug.

Comment 4

[Jeff Muizelaar [:jrmuizel]]

Here's a profile with my gen6 https://share.firefox.dev/32sqKU4