615911 - High cpu when viewing browser on dual monitors.

Status: RESOLVED WORKSFORME

(Firefox :: General, defect)

Description

[Christopher]

User-Agent:       Mozilla/5.0 (Windows NT 5.1; rv:2.0b7) Gecko/20100101 Firefox/4.0b7
Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b7) Gecko/20100101 Firefox/4.0b7

When using dual monitors on my laptop. If browser is displayed on laptop monitor it uses approx. 50% cpu. I see a huge slowdown in performance. If I move the browser to the second monitor this issue does not occur. 

Reproducible: Always

Steps to Reproduce:
1.Open task center to observe cpu. 
2.Open fire fox on laptop monitor.
3.Observe high cpu in takscenter
4.Move fire fox to second monitor
5.Observe task center to see cpu has fallen to almost 0.  
Actual Results:  
Saw high cpu during operation on laptop monitor, and reduction of cpu issue when moved to second monitor. 

Expected Results:  
Should not have seen a high cpu on either monitor. 

Bug does occur while in firefox safe mode, and themes and addons disabled. Have not noticed this on other comps with a single monitor.

Comment 1

[Wayne Mery (:wsmwk)]

Christopher, did this happen in version 3?  Does it still happen for version 5?

Comment 2

[Christopher]

Hi Wayne, 
No this only happened on the version 4 beta. It never happened on V3 or V5. I recently upgraded to the release of version 4, and it seems to be fixed. I'm currently on V4.0.1 and in the same env. It has not occurred since I upgraded to this about a month ago. 

Thanks
Chris

Comment 3

[Wayne Mery (:wsmwk)]

WFM in version 4 per reporter.
Thanks Christopher.