I was chatting with Jonathan Hawkins and some of the folks on the ASP.NET team about performance and Jonathan mentioned the startup time for large ASP.NET applications is improved on .NET 4. There are some improvements in the CLR and in ASP.NET itself that helped. If you have a giant app, you should do some tests. The word from the ASP.NET team is that you'll see improvements when the .NET framework (CLR) is warm in memory but the Web App is cold on disk . This is for shared hosting scenarios where the web server is loading and unloading web applications while .NET remains in memory. Web App Name NETFX3.5 SP1 NETFX4 Change Change as % of NETFX3.5 blogengine 1.959s 1.702s (0.256s) -13.08% dasblog 3.151s 2.818s (0.333s) -10.58% dotnetnuke...(read more) ...
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