javascript - a script on this page is causing ie to run slowly

Question

The problem is in the title - IE is misbehaving and is saying that there is a script running slowly - FF and Chrome don't have this problem.

How can I find the problem . .there's a lot of JS on that page. Checking by hand is not a good ideea

EDIT : It's a page from a project i'm working on... but I need a tool to find the problem.

End : It turned out to be the UpdatePanel - somehow it would get "confused" and would take too long to process something. I just threw it out the window - will only use JQuery from now on :D.

And I'm selecting Remy Sharp's answere because I really didn't know about the tool and it seems pretty cool.

Answer 1

Long running scripts are detected differently by different browsers:

• IE will raise the warning once 5 million statements have been executed (more info on MSDN)
• Firefox will warn if the script takes longer than 10 seconds (more info on MDN)
• Safari will warn if the script takes longer than 5 seconds
• Chrome (1.0) has no set limit and will simply keep trying until an OutOfMemory exception at which point it crashes
• Opera will just continue to run forever, without warning.

Nicholas Zakas has written an excellent article covering this topic.

As such - the best way to avoid these problems is by reducing looping, recursion and DOM manipulation.