230409 - Processor usage 100% when viewing page

Status: RESOLVED INVALID

(Core :: Web Painting, defect)

Description

[Jeroen Benckhuijsen]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5) Gecko/20031007
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5) Gecko/20031007

When viewing this page, the processor usage climbs to 100%. This is caused by
the marquee on the top of the page. Viewing this page with MSIE causes a
processor usage of a mere 1 to 3% (system: PII 500). Because of the high
processor usage, the page becomes unviewable. The marquee was created using a
standard script from www.dynamicdrive.com (see source code).

Reproducible: Always

Steps to Reproduce:
1.View the page

Actual Results:  
Processor usage of 100%

Expected Results:  
Processor usage < 10%

The site's url will change in the future form www.festivalroyal.nl to
www.queensdaymaastricht.nl

Comment 1

[Boris Zbarsky [:bzbarsky]]

Not JS engine. Profile shows nothing unexpected -- lots of style resolution, etc.

Curiously, cpu usage drops to nearly 0 if I switch to a different virtual
desktop, suggesting that we are doing way excessive painting here.  All this on
Linux, of course.  So over to roc to look at this.

It'd be nice to see whether a small or at least simple testcase can reproduce
the problem...

Comment 2

[dolphinling]

Attachment: html testcased, nothing done to JS

I cleaned out all the html--the only thing of note is a table with
height='100%' width='100%' and align='left'.

(I'm pretty sure) I didn't touch the JS.

Comment 3

[Jesiah S]

I see this using the testcase on LInux 2004011808.
X is using ~65% and moz is using ~27%

Comment 4

[Oleg Sidletskiy]

Perhaps the URL should be updated to the new address. At the new site I see
80-100% CPU usage (Athlon XP 3200+ 2.2 Ghz, 512 MB), but no CPU usage problem
with the testcase.

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7b) Gecko/20040329
Firefox/0.8.0+

Comment 5

[Oleg Sidletskiy]

sorry for the bugspam, but I'm pretty sure the problem lies within the scrolling
text - as soon as I mouse over it, the text stops scrolling and CPU usage drops
to 0, but as soon as the mouse pointer is moved out of the scroll text area CPU
usage jumps back to 100%.

Comment 6

[Jason Barnabe (np)]

WFM on Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.3) Gecko/20040925
Firefox/0.10

Comment 7

[Jeroen Benckhuijsen]

Unfortunaly still no change for me with Moz 1.7.3/Fedora 2. X and mozilla use
both nearly 50% CPU (PII 333) and the text animation isn't fluently

Comment 8

[Jeroen Benckhuijsen]

Updated url to new domainname.

Any change this will get fixed? 

FYI FF 1.02 also has this issue

Comment 9

[Gervase Markham [:gerv]]

This is an automated message, with ID "auto-resolve01".

This bug has had no comments for a long time. Statistically, we have found that
bug reports that have not been confirmed by a second user after three months are
highly unlikely to be the source of a fix to the code.

While your input is very important to us, our resources are limited and so we
are asking for your help in focussing our efforts. If you can still reproduce
this problem in the latest version of the product (see below for how to obtain a
copy) or, for feature requests, if it's not present in the latest version and
you still believe we should implement it, please visit the URL of this bug
(given at the top of this mail) and add a comment to that effect, giving more
reproduction information if you have it.

If it is not a problem any longer, you need take no action. If this bug is not
changed in any way in the next two weeks, it will be automatically resolved.
Thank you for your help in this matter.

The latest beta releases can be obtained from:
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Seamonkey:   http://www.mozilla.org/projects/seamonkey/

Comment 10

[Wayne Mery (:wsmwk)]

URL WFM, after an inital spike in CPU it settles to 2-10% cpu.
However testcase attachment stays at 30-70% cpu.
Jeroen, what are your results with firefox 1.5?

Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8) Gecko/20051111 Firefox/1.5

Comment 11

[Jeroen Benckhuijsen]

The testcase also results in a constant CPU usage of about 40 % (AMD Athlon XP 2, Firefox 1.5 compiled as i386). CPU usage is caused by the X server whoose memory usage fluctuates about 6 mb up and down (thus between 109 and 105 MB currently).

BTW. The HTML/JS code of the original URL is changed thus no longer valid as a testcase

Comment 12

[Wayne Mery (:wsmwk)]

so we can close this as invalid