870000 - tmbw.net causes CPU usage to spike and browser UI to become unresponsive, scrolling and navigating pages barely works

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[Elad Alfassa]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:20.0) Gecko/20100101 Firefox/20.0
Build ID: 20130401133651

Steps to reproduce:

went to http://tmbw.net/

Note that this might be a Gecko issue, because I noticed it on Android as well


Actual results:

The browser became unresponsive: resizing the window took few seconds to fit the browser chrome into the new window size, switching tabs was extremely slow, scrolling and clicking on links on this page was almost impossible. After few seconds, the whole browser just froze.


Expected results:

It should work, of course :)

Comment 1

[Tomer Cohen :tomer]

I can confirm this problem reproduce here as well on Aurora22/Linux x86. Disabling JavaScript in the browser preferences seems to workaround the problem, which means that it probably a JavaScript performance problem.

Comment 2

[Andreas Wagner [:TheOne] [use NI]]

This seems to be Linux specific.

Can reproduce on Ubuntu 12.10 with Aurora 22.
Cannot reproduce on Windows 7 with Release 20, Beta 21, Aurora 22, Nightly 23.

Comment 3

[Loic]

Did it use to work in previous Linux version of Firefox?

Comment 4

[Elad Alfassa]

Yes, but I'm not sure when it started happening, so more testing has to be preformed.

Comment 5

[Ty]

This same behavior occurs for site http://www.slickedit.com.  Product display at top of the web page is where loop appears to be occurring.

Comment 6

[Ty]

(In reply to Ty from comment #5)
> This same behavior occurs for site http://www.slickedit.com.  Product
> display at top of the web page is where loop appears to be occurring.

Forgot to add:  I'm running FFX beta v22 on Win XP SP3

Comment 7

[(mostly gone) XtC4UaLL [:xtc4uall]]

(In reply to Elad Alfassa from comment #4)
> Yes, but I'm not sure when it started happening, so more testing has to be
> preformed.

Might want to try https://github.com/mozilla/mozregression/

Comment 8

[(mostly gone) XtC4UaLL [:xtc4uall]]

Is this (http://tmbw.net/) still an Issue with 23/Trunk?

Comment 9

[Ty]

(In reply to XtC4UaLL [:xtc4uall] from comment #8)
> Is this (http://tmbw.net/) still an Issue with 23/Trunk?

I'm now running Firefox version 24.0.0.4975.  The two sites I cited as causing the CPU/responsiveness problem (http://tmbw.net and http://www.slickedit.com) do not trigger the problem in this version.  I am still using O/S Win XP SP3 (32-bit).  Looks like it may be fixed for this platform.

Comment 10

[Elad Alfassa]

Still an issue under Linux.