1939683 - FirefoxCP Isolated Web Content CPU Spike on Youtube

Status: RESOLVED DUPLICATE of bug 1939295

(Core :: Performance, enhancement)

Description

[michaelthecsguy]

Attachment: firefox-memory-report.json.gz

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0

Steps to reproduce:

1. multiple tabs opens including some Youtube Videos
2. MacOS Catalina
3. Firefox 128.5.2esr

Actual results:

1. Macbook Pro fan starts to run
2. Start to see Firefox CP Isolated Web Content above 50% CPU usage
3. If I close more Youtube Video tabs or use about:memory?verbose to garbage collect, the CPU usage is lower

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Graphics: WebRender' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Andrew McCreight [:mccr8]]

Thank you for the report. I see 40 or more ghost windows from YouTube, so this is probably the same issue as bug 1939295. We released a fix for that a few days ago, so please update Firefox and hopefully that will fix the problem.