ASP.NET application on IIS7 - very slow startup after iisreset

Question

I have an ASP.NET 3.5 website running under IIS7 on Windows 2008.

When I restart IIS (iisreset), then hit a page, the initial startup is really slow.

I see the f

Answer 1

Thats the compilation of asp.Net pages into intermediate language + JIT compilation - it only happens the first time the page is loaded. (See http://msdn.microsoft.com/en-us/library/ms366723.aspx)

If it really bothers you then you can stop it from happening by pre-compiling your site.

EDIT: Just re-read the question - 60 seconds is very long, and you would expect to see some processor activity during that time. Check the EventLog for errors / messages in the System and Application destinations. Also try creating a crash dump of the w3wp process during this 60 seconds - there is an chance you might recognise what its doing by looking at some of the call stacks.

If it takes exactly 60 seconds each time then its likely that its waiting for something to time out - 60 seconds is a nice round number. Make sure that it has proper connections to the domain controllers etc...

(If there are some IIS diagnostic tools that would do a better job then I'm afraid I'm not aware of them, this question might be more suited to ServerFault, the above is a much more developer-ish approach to troubleshooting :-p)