Search for web performance source

We are trying to identify a performance issue in the asp.net solution in Windows 2008.

  • An error page that does not have access to the database and very little logic takes 10 seconds. Other pages in 70 seconds.
  • Performance drops noticeably only at high load
  • 5 GB total memory usage 16 available
  • W3wp.exe using 2.5 GB
  • multiple Connection_Dropped DefaultAppPool in httperr file
  • OK. 1,500 connections, Asp.net's queue length is 10,000
  • Low CPU consumption.

Anyone have an idea what I can check next?

Edit

Now I used VS 2010 to run a performance test with it on a test virtual server.

I launched 200 users with incremental builds and no wait.

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