High CPU usage on moving mouse over Firefox Window




8 years ago
7 years ago


(Reporter: macster_smart, Unassigned)


4.0 Branch
Windows XP

Firefox Tracking Flags

(Not tracked)




8 years ago
User-Agent:       Mozilla/5.0 (Windows NT 5.1; rv:2.0b12) Gecko/20100101 Firefox/4.0b12
Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b12) Gecko/20100101 Firefox/4.0b12

This is not an isolated problem with the actual build since this behavior was noticed in almost all Firefox versions installed on my machine. I decided to post it now maybe someone will fix it once and for all. :)
If I constantly move the mouse over the desktop I get an average 6 % CPU usage, If I constantly moved it over an Explorer Window the same value, if I constantly move it over an Internet Explorer 8 Window I get an average of 15 % CPU usage, and if I constantly move it over an Firefox Window with no webpage open in it I get an average of 40 % CPU usage which I think is pretty much for no reason. 
If I open a webpage like Youtube in Firefox and constantly move the mouse on Youtube page I get 100 % CPU usage.

My setup is as follows:
Athlon XP 1500 Mhz
Windows XP SP3
ATI Radeon 9600 PRO DX 9 card pixel&vertex shader v2
USB 2 Genius Laser Mouse 2400 DPI

Reproducible: Always

Steps to Reproduce:
Just move the mouse over Firefox Window.
Actual Results:  
CPU usage increases too much for no reason.

Expected Results:  
I expect someone to fix this. 

Since it's not a feature it means it's a BUG :)


8 years ago
Version: unspecified → Trunk

Comment 1

8 years ago
This is reproducible on : Mozilla/5.0 (Windows NT 5.1; rv:2.0b13pre) Gecko/20110227 Firefox/4.0b13pre

But I do not think this is a FireFox bug because this is also reproducible on Chrome and Safari

Comment 2

7 years ago
Reporter -> Are you still experiencing this issue? Have you tried safe mode or a new profile?

Comment 3

7 years ago
Any update? Please address comment 2
Version: Trunk → 4.0 Branch

Comment 4

7 years ago
Closing bug as Incomplete - if you are still experiencing this issue or have more information to provide feel free to post back here and we can re-open the bug. You can also get assistance by visiting the Firefox help site -> http://support.mozilla.com/en-US/kb/Ask+a+question
Last Resolved: 7 years ago
Resolution: --- → INCOMPLETE
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