Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

"We’ve reduced CPU usage on macOS in Firefox" is false.

  • 4 replies
  • 1 has this problem
  • 1 view
  • Last reply by Bithiah

Longwinded
Longwinded
more options

So obviously "We’ve reduced CPU usage on macOS in Firefox and WindowServer during event processing" is demonstrably false.

I went to Headspace, streamed an audio in Safari, noted the %CPU in Activity barely budged more than 20%. Then streamed the same audio in Firefox 93, noted the %CPU rocketed up to 150% and the laptop got hot and the fan kicked into high gear. Then I updated Firefox, restarted computer fresh, streamed the same audio and.....surprise, surprise no fix, no change, %CPU rockets up like before.

So obviously "We’ve reduced CPU usage on macOS in Firefox and WindowServer during event processing" is demonstrably false. I went to Headspace, streamed an audio in Safari, noted the %CPU in Activity barely budged more than 20%. Then streamed the same audio in Firefox 93, noted the %CPU rocketed up to 150% and the laptop got hot and the fan kicked into high gear. Then I updated Firefox, restarted computer fresh, streamed the same audio and.....surprise, surprise no fix, no change, %CPU rockets up like before.

All Replies (4)

Longwinded
Longwinded Question owner
more options

Here is the picture which Firefox was unable to attach previously.

TyDraniu
TyDraniu
  • Top 10 Contributor
more options

1. Can you create a new issue about it on https://bugzilla.mozilla.org/enter_bug.cgi ? Please send back the bug number. Thanks. 2. Previously mentioned statement is about event processing. Streaming audio is not an "event".

Longwinded
Longwinded Question owner
more options

https://bugzilla.mozilla.org/show_bug.cgi?id=1744848

I find the high CPU usage unusual because I stream video on CBS and audio on Pandora all the time without problems. Even YouTube might run around 100% but it does not run hot at high fan speed.

Modified by Longwinded

Bithiah
Bithiah
more options

Hey there!

See the following website on what to do to fix the performance issue:

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-or-cpu-resources

Hope I helped!

Kind regards,

Bithiah