[Expired for firefox (Ubuntu) because there has been no activity for 60
days.]
** Changed in: firefox (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/66350
Title:
Firefox uses high CPU for extended periods of time when spawning a new
window with many tabs already open
Status in “firefox” package in Ubuntu:
Expired
Status in “firefox-3.0” package in Ubuntu:
Won't Fix
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.
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