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 prob

Answer 1

Make sure that below JavaScript code is run only once:

Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(win_onload);

Above code is inside the function win_onload().

Answer 2

In my case having too many ASP.NET HoverMenuExtender controls in a GridView bound to a lot of rows was causing extremely slow performance. I removed the HoverMenuExtender and my speed issues (and the dialog) went away. Not quite related to why the dialog pops up, but it might help someone.