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Message #01689
[Bug 968533] Re: Alt-tab to Firefox sends Firefox to 100% CPU; unity-panel-service to 80% CPU and hud-service to 20-80% CPU
The problem may be more difficult.
The high load - when switching between apps with Alt-Tab appears randomly.
The amount of FF bookmarks in my case is high but do not changing much. Most time I have no problems while running FF and switching to another apps - windows with Alt-Tab.
But "sometimes" happens, that high load (100% on both cores - for many seconds) occurs and stays until I kill FF and log out->in.
If it would be caused by bookmarks - then it should happen all time -
the same way. Not just occasionally.
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https://bugs.launchpad.net/bugs/968533
Title:
Alt-tab to Firefox sends Firefox to 100% CPU; unity-panel-service to
80% CPU and hud-service to 20-80% CPU
Status in Unity:
Confirmed
Status in “unity” package in Ubuntu:
Confirmed
Bug description:
I've been seeing UI hangs after switching tabs in Firefox, and
switching from other applications to Firefox.
It can take 3-8 seconds to change *tab*. During this time the CPU is
maxed out; typical output from 'top' during this period shows 'hud-
service' and 'unity-panel-service' combined using about the same CPU
as Firefox itself:
100 10.4 26:07.73 firefox
53 0.6 6:14.86 hud-service
38 1.5 6:42.14 unity-panel-service
I suspect that the change is causing a (an inefficient) re-index
related to updated menu structures. (Eg. something like the history
menu, although I can't see what it is as don't currently have a menu
bar).
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