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 following activity in Process Explorer:

  • w3wp.exe spawns, but shows 0% CPU activity for about 60 seconds
  • Finally, w3wp.exe goes to 50% CPU for about 5 seconds and then the page loads.

I don't see any other processes using CPU during this time either. It basically just hangs.

What's going on during all that time? How can I track down what is taking all this time?

asp.net performance iis startup
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