[Bug 66350] Re: Firefox uses high CPU for extended periods of time when spawning a new window with many tabs already open

[koudy]

In my case, the behaviour was caused by the extensive usage of JavaScript in the web pages. JavaScript of the complex pages spends lot of memory and thus the swapping on HDD was often neccesary (I have only 512 MB). I have installed addon NoScript and my problem was solved.
> ------------ Původní zpráva ------------
> Od: Martin Mai <martinmai1024 at web.de>
> Předmět: [Bug 66350] Re: Firefox uses high CPU for extended periods of time when
> spawning a new window with many tabs already open
> Datum: 20.1.2009 21:03:45
> ----------------------------------------
> We were wondering if this is still an issue for you. Can you try with
> the latest firefox version? Thanks in advance.
> 
> -- 
> Firefox uses high CPU for extended periods of time when spawning a new window
> with many tabs already open
> https://bugs.launchpad.net/bugs/66350
> You received this bug notification because you are a direct subscriber
> of the bug.
> 
> Status in “firefox” source package in Ubuntu: Incomplete
> Status in “firefox-3.0” source package in Ubuntu: Confirmed
> 
> Bug description:
> If I have many browser tabs (in one or many windows) open already and I open a
> new window (either by clicking a link that opens a new window, implicitly having
> a window opened by a pop-up that slips through the cracks, or by invoking the
> "new window" action by the keyboard or menu), Firefox locks up (fails to repaint
> any of its windows) for an extended period of time (30 to 40 seconds is not
> unheardof) and uses 100% CPU. The time spent appears to be proportional to the
> number of tabs open.
> 
> I took a preliminary look into Firefox with a debugger while it was doing this,
> and a few samples showed that it appeared to be spending some time laying out
> all of its pages that it had open again. I could be way off base, though; I took
> 5 or 6 non-scientific samples with control-c (gdb) bt, and I don't know
> Firefox's internals well enough to say that's what those functions actually
> did.
> 
> It adversely impacts Firefox's usability.
> 
> 
>

-- 
Firefox uses high CPU for extended periods of time when spawning a new window with many tabs already open
https://bugs.launchpad.net/bugs/66350
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Bugs, which is a bug assignee.