Red Hat Bugzilla – Bug 863644
Firefox idle cpu usage very high (>50%)
Last modified: 2013-07-31 21:13:13 EDT
Description of problem:
When opening a few tabs in firefox and then not touching it at all for hours, its idle cpu usage will constantly stay about 50% (i3 processor). This is a problem for laptop users.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Browse for a few minutes, opening 10+ tabs
2. Leave firefox as it is and don't touch it again
3. Open a terminal, run "top" and take a look at the firefox process
Firefox memory usage is nicely low, but CPU usage is constantly >50%. Laptop fan is making noticeable constant noice. As soon as I close firefox, the fan goes instantly slower.
When not touched for a while, firefox won't use much CPU and will not cause the laptop fan to spin fast constantly, indicating a large battery drain while doing nothing.
Try close one tab at a time and check CPU usage to determine which tab is making CPU busy and let us know. Thanks.
I wasn't viewing any media pages, and if I recall correctly, flash was even disabled (but I might be wrong on that). Also due to the firefox architecture, shouldn't flash purely affect the plugin-container process?
When I ran into >50% cpu usage, I once closed *ALL TABS* so I only had a blank page (about:blank) tab open, and CPU usage was still above 50%. After reopening firefox, it went down to <5% again. However, so far I was unable to reproduce that most gross incarnation of excessive cpu usage.
In overall, it seems to be much more random and irregular than I assumed when opening this bug report initially, but nevertheless there appears to be some sort of problem/bug.
I see. This might also be caused by addons (if you have some installed). Try to run firefox in safe mode by command:
and check cpu usage again please.
Sample problem here.
I just updated to f18/rawhide from f17, and it is vastly different wrt cpu use (same plugins and browsing habbits). It is in fact so bad that I am thinking about switching browsers (as my laptops T and battery use is horrible).
I have addblock and noscript installed, I would expect this would lower cpu use.
Will see if I can debug this some more
It seems my own problems with firefox cpu where a (mostly?) a result of the new intel driver. Do not have the problem when I switch to the sna accel method, though that introduces some minor artefacts.
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