628247 - CPU stuck at 100% during normal use

Status: RESOLVED WORKSFORME

(Core :: General, defect)

Description

[Nicola Orritos]

User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:2.0b10pre) Gecko/20110121 Firefox/4.0b10pre
Build Identifier: 4.0b10pre (2011-01-21)

As soon as started the browser takes almost all the CPU. This happens even with Flash plugin disabled.

Reproducible: Always

Steps to Reproduce:
1. Just start the browser
Actual Results:  
As soon as started the browser takes almost all the CPU.

Comment 1

[Matthias Versen [:Matti]]

Please try http://support.mozilla.com/en-US/kb/Safe+Mode

Comment 2

[Nicola Orritos]

(In reply to comment #1)
> Please try http://support.mozilla.com/en-US/kb/Safe+Mode

I've tried it and I can confirm it happens even in safe mode. Please note that I have a great number (66 :-) ) of tabs open.

Comment 3

[Nicola Orritos]

(In reply to comment #2)
> (In reply to comment #1)
> > Please try http://support.mozilla.com/en-US/kb/Safe+Mode
> 
> I've tried it and I can confirm it happens even in safe mode. Please note that
> I have a great number (66 :-) ) of tabs open.

By having just one tab open (the bugzilla page I'm editing) the situation looks really better: the CPU is now below 5-6%.

By opening 10 tabs, with 2-3 of them using Flash, CPU usage increased again to 20-30% (and this one is still far more than previous Firefox versions).

10 tabs and no Flash (I only opened tabs with no Flash in them) is below 10-15%.

Comment 4

[Marco Castelluccio [:marco]]

Do you see high CPU usage also when Firefox is idle? Do you still see this issue with the current version of Firefox?

Comment 5

[Nicola Orritos]

No, I see very less CPU usage in the last Firefox versions and usually plugin-container is the most "voracious" CPU-eater. But we're talking of less than 30% CPU usage with more than 80 tabs open.