593632 - Javascript heavy pages seem to be hanging

Status: RESOLVED DUPLICATE of bug 594108

(Core :: JavaScript Engine, defect)

Description

[Michael]

User-Agent:       Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b4) Gecko/20100818 Firefox/4.0b4
Build Identifier: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b4) Gecko/20100818 Firefox/4.0b4

Pages that are heavy on Javascript, such as the Facebook news feed and gmail see, to load a small part of the page, then hang for several seconds to several minutes.  Some never complete loading.  The problem does not occur in Safari on the same machine.

Reproducible: Always

Steps to Reproduce:
1.  Log into gmail
2.  A "loading" bar graph appears.
3.  Page fails to load completely.
4.  Log into Facebook
5.  Page fails to load completely, or is delayed for about 10-20 seconds.
6.  Other sites load normally.
Actual Results:  
Javascript heavy pages fail to load properly.  Other sites load normally.

Expected Results:  
Pages load properly.

Comment 1

[David Mandelin [:dmandelin]]

Can you try a TM nightly build [1] on that? Jaegermonkey, the new methodjit compiler, has landed there and those sites seem to be much faster.

[1] http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-tracemonkey/

Comment 2

[Michael]

Just tried the latest build.  Completely unusable.  I got spinning pinwheels and messages about stopping unresponsive scripts on nearly every tab.  I had to force-quit the browser.  Minefield appeared to be taking 100% of at least one core on my machine.  One of the tabs that I got the error on was http://www.9to5mac.com/ .  I think it was appearing on all tabs though.  I really couldn't tell.  I never got as far as actually being able to use the browser.

Comment 3

[David Mandelin [:dmandelin]]

This is probably bug 594108.