Huge CPU usage while moving mouse over Firefox

psylence

Any else notice this? I literally just did, been using this for months and never really realized why I thought firefox felt so slow... I can hear my CPU fan revving up and down while I move my mouse over this window.

If I move my mouse continuously around on top of a firefox rendered web page (that page itself, not the menu bars, or tabs, etc...) I can hit 100% CPU if I move it enough. I move it off to a blank desktop, other window on top of firefox, anything else, it drops to normal, expected minimal CPU use... Keyboard scrolling a page does the same...

Fox seems to take a lot of CPU for painting in general, smearing when dragging a firefox window around, etc...

I use Windows at work and firefox always felt so much snappier...

My system is an Athlon 3200+, ATI 9600XT, 768MB RAM... Shouldn't be having these problems but they seem localized to firefox... Mozilla and Epiphany w/Gecko backend don't exhibit this behavior.

bcmm · Posted: Fri Jun 03, 2005 12:08 pm Post subject:

I'm seeing this too: 50%-100% CPU utilisation over Firefox as opposed to 30%-50% for Konqueror on the same web page. Interesting.

I wonder if this is worth posting as a bug?

(Then again I am using GTK-QT, which might slow it down).
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psylence · Posted: Fri Jun 03, 2005 12:29 pm Post subject:

Maybe slow it a little bit, but unless it's just horrible something else is going on... And I'm not using GTK-QT here, this is a straight Gnome system, it's it still bad... Can't find any mention of this on firefox's forums either, tho the search does suck...

Not sure if it warrants a bug, typically stuff like this gets largely disregarded so this is probably the best place to try to resolve it...

[sinz] · n00b Joined: 08 Jun 2004 Posts: 71

I've been noticing this too, but only while firefox is rendering the page and it's definitely new with firefox 1.0.4. Are any of you using a different version and experiencing this or is everyone on 1.0.4? My line is ~8Mbit and pages used to load instantly with 1.0.3 but now it seems firefox is struggling to render them or something as the app pauses between pages and even the little swirly deal at the top right seems to stop dead for a few seconds. I may roll back to 1.0.3 or try the firefox-bin ebuild unless anyone has another suggestion.

psylence · Posted: Fri Jun 10, 2005 1:06 am Post subject:

Hmm, a total reinstall of my system, and I notice it's not doing it anymore... May be related to an extension or a stale library I had... Argh!

bcmm · Posted: Sat Jun 11, 2005 10:25 pm Post subject:

Totally untested theory: mouse gestures extension does this?
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psylence · Posted: Mon Jun 13, 2005 1:07 pm Post subject:

bcmm · Posted: Mon Jun 13, 2005 4:37 pm Post subject:

Is it changes to the profile or the system-wide installation that does it, or did both change at once? And which cured it?
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Whiteboy · n00b Joined: 24 Feb 2005 Posts: 2

I too have this problem and would love to know a better solution than a total reinstall. I thought it was gtk at first, but after recompiling that to no avail. Could it possibly be a gnome thing? I believe that this problem started for me either when firefox had a version bump to 1.0.3 or when I changed profiles. Also, 100% CPU is used when holding keyboard keys in input boxes (type a long line then hold backspace.. it takes forever to clear the input box). This never used to happen, any ideas would be appreciated.

zieloo · Veteran Joined: 28 Mar 2004 Posts: 1337

bcmm · Posted: Fri Jun 17, 2005 2:23 pm Post subject:

KDE user here; and it's definitely not a Gnome thing.
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zieloo · Veteran Joined: 28 Mar 2004 Posts: 1337