292486 - firefox using 100% cpu for seconds (linux)

Status: RESOLVED DUPLICATE of bug 267525

(Firefox :: Shell Integration, defect)

Description

[harm]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7) Gecko/20050416 Fedora/1.0.3-1.3.1 Firefox/1.0.3
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7) Gecko/20050416 Fedora/1.0.3-1.3.1 Firefox/1.0.3

I found a site where rendering a page is extremely slow. 
firefox performance on other url's is fine.

Reproducible: Always

Steps to Reproduce:
1. load url   (fedora-test mailing list)
2. click a message
3. click back

Actual Results:  
mozilla/firefox uses 100% cpu for about 5-10 seconds. Then the page is rendered

Expected Results:  
The page should be rendered instantaniously.

Same problem with mozilla 1.7.7 (Mozilla/5.0 (X11; U; Linux i686; en-US;
rv:1.7.7) Gecko/20050417 Fedora/1.7.7-1.3.1)
I saw the problem on firefox/mozilla binaries that are provided by fedora (FC3).
IE renders it fast, so this indicates a mozilla/firefox bug.
I only saw the performance problem on linux. I think windows is fine.

Comment 1

[Thomas K. (:tom)]

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b2) Gecko/20050426
Firefox/1.0+

I only had around 90% cpu for 3 seconds after the page started loading, and it
was pretty much visible the whole time (watched it load).

Comment 2

[Ryuichi KUBUKI]

*** This bug has been marked as a duplicate of 267525 ***