500877 - 100 % CPU Usage 3.5 RC 3

Status: RESOLVED INCOMPLETE

(Firefox :: General, defect)

Description

[Aly]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 (.NET CLR 3.5.30729)

i just download the FireFox 3.5 RC 3 ... CPU Usage 100 % dats quite wired ... my all services are below 1% but 97 process taken by Firefox ... 


http://img141.imageshack.us/i/bug2ocp.jpg/

Reproducible: Always

Comment 1

[Matthias Versen [:Matti]]

The first thing to do in such a case is http://support.mozilla.com/en-US/kb/Safe+Mode

Comment 2

[Andy.J.S]

I can confirm this behaviour happens on my 3.5 release
winXP

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1) Gecko/20090624 Firefox/3.5 ID:20090624025744

http://img34.imageshack.us/img34/1899/ff35cpuusage20090624025.jpg

happens on all non-cached pages, safe-mode, fresh profile, fresh install directory, no plugins, 3rd party adverts blocked by hosts file

after the page has fully loaded and rendered there is an immediate spike in CPU usage (99%) for 5-10 seconds, this behaviour didnt happen in 3.11, happened on the RC2 candidate and the final 3.5 release, javascript on or off the results are the same

Comment 3

[Kevin Brosnan]

What pages are you loading?

Comment 4

[Andy.J.S]

I get this on fark, slashdot, metafilter, basically any site that is not cached (visited that session) and/or has dynamic content, no av/firewall on my test machine (natted) and its firefox.exe that is causing the 100% cpu 
the machine is also fully uptodate (xpsp3 etc), regressing back to 3.11 everything goes back to normal (minimal cpu usage, fast loading on non-cached/dynamic content sites)

Comment 5

[register]

I tested this with many versions of web-sites.
It seems to be the amount of used formular fields. Any time my sites uses more then perhaps 200 fields at once, a cpu-sleep-time follows.
In one site there are more than 2000 radio buttons - I have to wait for 1 minute until Firefox/3.5.1 re-awakes.

Comment 6

[Matthias Versen [:Matti]]

[e-mail]: you mean a known and different bug

Comment 7

[Kevin Brosnan]

Comment 5 is seeing bug 477564. Which appears to be unrelated to this bug.

Comment 8

[Tyler Downer [He/Him]]

Reporter, are you still seeing this issue with Firefox 3.6.13 or later in safe mode or a fresh profile? If not, please close. These links can help you in your testing.
http://support.mozilla.com/kb/Safe+Mode
http://support.mozilla.com/kb/Managing+profiles

Comment 9

[Tyler Downer [He/Him]]

This bug has had the CLOSEME tag for several weeks and the date in the tag is far gone. If the reporter can still see this issue, Please retest with Firefox 3.6.x or later and a new profile (http://support.mozilla.com/kb/Managing+profiles). Then please remove the closeme tag in the whiteboard, mark the bug against the proper version and comment on the bug.