721607 - Browser hanging when scripts running

Status: RESOLVED INVALID

(Core :: JavaScript Engine, defect)

Description

[Martin Best (:mbest)]

Browser hangs and page loads take up to 10 seconds on load.  This started when upgrading to Firefox 10 Beta.  I have disabled all the plugins, no change is status.  Also, when looking at Google's search result page, the browser locks up whenever typing in to the on page search box and auto complete triggers.

Comment 1

[David Mandelin [:dmandelin]]

Could you run Shark on it? Or could you bring it by to us to run Shark?

Comment 2

[Andrew McCreight [:mccr8]]

The machine didn't seem to have Shark installed.  Or at least, searching for Shark didn't turn up anything.

The browser seems mostly fine after it is done loading and you aren't interacting with the page directly.  On cnn.com, you can scroll up and down with almost zero jank.

Comment 3

[David Mandelin [:dmandelin]]

It's not part of the default install. It's kind of hidden but there are pointers here:  https://developer.mozilla.org/en/Performance/Profiling_with_Shark

Or you could try the builtin profiler with the about:jank extension.

Comment 4

[Andrew McCreight [:mccr8]]

about:jank requires a recent nightly, but if you can reproduce it with Nightly, that would be interesting, Martin.  Just download the nightly to your desktop or something and run it when you Beta browser isn't open.

Comment 5

[Boris Zbarsky [:bzbarsky]]

Also, if this is a regression it might be good to find a regression range...