HOW TO speed up a ASP.NET AJAX web app

Just like making web pages cross-browser doesn't have a straight-forward solution, speeding up your ASP.NET AJAX based web application requires an understanding of it's internal aspects. Outlined below are some performance tips compiled from various sources -

• UpdatePanels can sometimes be dangerous. If you are using an UpdatePanel, reduce the number of controls within it if you can.
• Update without UpdatePanels - call WebMethods from JavaScript using ASP.NET AJAX
• Enable Compression and Caching using the scriptResourceHandler element in the web.config of your ASP.NET AJAX application.
• Consider setting ScriptManager control's properties LoadScriptsBeforeUI to "False" and explicitly set ScriptMode to "Release".

Generic ASP.NET performance improvement tips that also strongly relate to ASP.NET AJAX -

• Use tools like FireFox Firebug addon YSlow or the Fiddler add-on neXpert, to analyze web pages and identify why they're slow.
  
• Don’t run production ASP.NET Applications with debug=”true” setting in web.config -
• Disable viewstate if possible.
• Cache images & other static files that do not change frequently.
  

To be continued...

Also see - HOW TO improve the front-end performance of a website

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