Ajax AsyncFileUpload Script Error

Hi,

I have updated to the new AjaxControlToolkit and I have used the new AsyncFileUpload control on a page.

When I load my page  I got the following error:

"A script on this page may be busy, or it may have stopped responding. You can stop the script now, open the script in the debugger, or let the script continue.

Script: http://localhost:5901/ScriptResource.axd?d=lwQTcTeSAoYmm52QKHEI0iw8LxrNWInRka24ET12-9eiUw8GbqqgGolgoZE1VycMlVBAXHpig-IGnPI5nzXbkw2&t=fffffffffb3279ba:194

It also slow loading speed of page. I also increase time max_timeout in FireFox inabout:config.

I also read this article on firefox:

http://support.mozilla.com/en-US/kb/Warning+Unresponsive+script.

But it is not giving any good solution.

Do Any Experts know what could be the issue? How we can solve this?

Thanks