Incredible what a speed boost you can get with your ASP.NET AJAX apps by simply adding a few optional parameters. Shockingly faster in a lot of situations!

In your ScriptManager declaration, if you add the following parameters, you should see a very nice performance improvement:

• EnablePartialRendering="true" (Alows just the parts of the page that have changed to be transmitted across the wire.)
• LoadScriptsBeforeUI="false" (Postpones quite a few of the script downloads until after the main page content is finished downloading by adding the script references to the end of the tag.)
• ScriptMode="Release" (Causes AJAX to emit really tight production-ready code. Only drawback to this is when debugging an AJAX issue, you'll need to flip this back to get debug info.)

< asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true" LoadScriptsBeforeUI="false" ScriptMode="Release" />