IE7: “Script is running slowly, do you want to stop it?” - How can I figure out which script it is?

Question

The damn thing gives me NO other information. It does not occur in any other browser.

Answer 1

This is caused by an unbounded loop of some sort.

Culprits could be: for, setTimeout, do and while.

How large is this collection of scripts? You could try the script debugging/profiling in IE8 while running in IE7 compatibility mode.

If that doesn't work, sometimes the old, remove x to isolate y works, albeit slowly.

Answer 2

Use Dynatrace ajax edition to profile you javascript. That will tell you exactly what is using too much cpu time, no need to guess :)