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I've tried to investigate slow load of UpdatePanel. It works quick enough in FireFox, slow in IE 7 and even more slower in IE6.

I found a few related links:

In production make sure that <compilation debug="false"> is in your web.config(tip from

Delayed load with an UpdatePanel and similar post.

The top 10 mistakes when using AJAX recommends do not  put everything in a UpdatePanel.
"Are you making these 3 common ASP.NET AJAX mistakes?" suggest to use  IsPostBack, IsInAsyncPostBack and __EVENTTARGET to avoid redundant execution of code during partial postbacks.

The article "Build Google IG like Ajax Start Page in 7 days using ASP.NET Ajax and .NET 3.0" shows(among other intersting things) how to consider what to include into UpdatePanes.

Dynamic User Control, Ajaxify your controls suggests an alternative to UpdatePanel without instantiation the full page ,but the user control CANNOT depend on the page it lives in.

Loading UserControl Dynamically in UpdatePanel

Post "How to solve slow reponse with ASP.NET AJAX in IE 6?" suggests(among others)  to apply IIS compression to imporove the loading time.(NOT SURE HOW?) 

 UpdatePanel: having fun with errors describes 3 techniques to handle errors. I prefer server logging using OnAsyncPostBackError="HandleError" . The ideas are detailed in Customizing Error Handling for ASP.NET UpdatePanel Controls. See also Ajax Exception Logging and How to improve ASP.NET AJAX error handling


Avoid calling unneseccary procedures during partial Update:

            ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page);
            if ((scriptManager != null) && (scriptManager.IsInAsyncPostBack))
            { //ASSUMPTION: the control is not included in AJAX UpdatePanel

Update after Damian Edwards's presentation "ASP.NET AJAX Tips and Tricks"
1. Always specify <UpdatePanel UpdateMode="conditional">
2. If there is no UpdatePanel on the page, specify ScriptManager.EnablePartialRendering="false".
3. Specify ChildrenAsTriggers=false, if you want to specify triggers explicitely
3. JavaScript calls _doPostBack('<%=btnTrigger.UniqueID %>
Posted on Monday, May 7, 2007 12:59 AM ASP.NET , AJAX | Back to top

Comments on this post: ASP.Net Ajax UpdatePanel links.

# re: ASP.Net Ajax UpdatePanel links.
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Wow this helped a lot for me. Thanks.

<compilation debug="false">
Left by Danny on Dec 15, 2008 3:05 AM

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