http://forums.asp.net/1008.aspxHere you can discuss UI-related issues with AJAX such as controls and client-side functionality including Silverlight controls for ASP.NETenCommunityServer 2007 SP1 (Build: 20510.895)http://forums.asp.net/thread/1997471.aspxThu, 08 Nov 2007 22:45:48 GMT4c671506-2930-414c-a40b-8bf57ded5924:1997471dwhitedwhite0http://forums.asp.net/thread/1997471.aspxhttp://forums.asp.net/commentrss.aspx?SectionID=1008&PostID=1997471<p>The short answer... most likely.&nbsp; What are you trying to accomplish?&nbsp; Usually if you have to nest UpdatePanels it&#39;s a warning sign of a poor design.&nbsp; You aren&#39;t saving anything except the visible refresh with an UpdatePanel, your full page is still processed as if it did a postback.</p> <p>You should read the following articles: <a href="http://encosia.com/2007/07/11/why-aspnet-ajax-updatepanels-are-dangerous">http://encosia.com/2007/07/11/why-aspnet-ajax-updatepanels-are-dangerous</a>&nbsp;and <a href="http://encosia.com/2007/10/24/are-you-making-these-3-common-aspnet-ajax-mistakes/">http://encosia.com/2007/10/24/are-you-making-these-3-common-aspnet-ajax-mistakes/</a></p> <p>-Damien</p>http://forums.asp.net/thread/1997314.aspxThu, 08 Nov 2007 21:17:25 GMT4c671506-2930-414c-a40b-8bf57ded5924:1997314rodcharrodchar0http://forums.asp.net/thread/1997314.aspxhttp://forums.asp.net/commentrss.aspx?SectionID=1008&PostID=1997314<p>hey all,</p> <p>i have about 3 to 4 updatePanels nested inside one main updatePanel and was wondering if that would cause hit in performance? like the more updatePanels you have on a page the slower?</p> <p>&nbsp;thanks,<br />rodchar</p>