ASP.NET MVC Application performance profiling

Question

How are people currently profiling the performance of their ASP.NET MVC applications?

I\'d be most interested in simple and free approaches.

Answer 1

Stack Overflow have released their own profiler as a new opensource project

http://miniprofiler.com/

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UPDATE:

It's also worth mentioning Glimpse as another alternative profiling tool

http://getglimpse.com/