Firefox 1.0.7 takes 100% CPU [was: Re: Firefox 1.5 very high load]

Eric S. Johansson esj at
Tue Jan 3 15:37:09 UTC 2006

Jan Moren wrote:
> On my not-very-fast laptop, with the default Firefox in Breezy, I now
> have 25 tabs open, to various websites. After they all finished loading,
> Firefox takes no CPU at all.

I have noticed that whenever ubuntu Firefox is "trying" to get some 
data, it sucks up 100% of the CPU.  I don't notice the same behavior 
under Windows.  The implication of that behavior is that instead of 
waiting on a socket, it's sitting there doing some kind of a busy wait 
loop.  It would be interesting to see if the same behavior occurs with 
other applications and if it does, that would imply the problem is 
further down in a library or kernel subsystem.

The only other time I've noticed significant resource consumption is one 
flash is in operation.  Sometimes I have pages with flash that just 
consume all the CPU available and don't go away until I kill that tab.


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