IE6 UpdatePanel Must move mouse to refresh after async call

So we are using IE6, and can not migrate to any other browser. So our application is having issues where after we have a postback inside our updatepanel. The browser looks like its resetting the DOM, one select box kind of jumps up a little, but then it freezes for 10-20 seconds, then the page gets updated. Now if we move the mouse it is instantly refreshed everytime. I found

http://support.microsoft.com/?kbid=2000262

but that only moved the time down from 20-30 to 10-20. This only happens our our XP sp3 laptops. Our dev machines run windows 2003 and IE6, and we do not experience the problem. Both machines don't go past 5% CPU usage when the upd开发者_Go百科ate panel comes back. Any suggestions anyone?

Found the problem. Inside a user control that was inside an update panel there was a link to a ../Site.css, which resolved to localhost/site.css That file did not exist because it was in localhost/web/site.css So when the update panel replaced the innerHTML of the div tag, IE wanted that file, it gave a 404, thus giving the lag that we had.