CRM 2011 - IE 7,8 9 Hangs

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I ran into a problem today that CRM IE7, 8, 9 hangs after 30 minutes because I have many XmlHttpRequest calls on the form.  I found a blog on MSDN that helped me out and I believe all of the us as a CRM developer should pay attention to.  The title of the blog article is Why You Should Use XMLHttpRequest Asynchronously, it’s a good read.