Ipcas has released SpeedTrace, an interesting free
trace and profiling tool for .NET.
Developers can use this version of SpeedTrace
to examine software manually with emphasis on performance. In addition,
SpeedTrace helps developers to find bottlenecks. This version of
SpeedTrace can also be applied to assist the testing process and future
releases will have APIs to support automated testing.

The tool seems really interesting, a good help on your testing processes.
Check it...