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NUnit tests are really slow when using Microsoft.Owin.Testing TestServer

After introducing Microsoft.Owin.Testing TestServer in a Test project we noticed that our test execution time increased from a few milliseconds for all tests to multiple seconds for each individual test.

With the help of dotTrace I noticed that most time was spent inside Microsoft.Owin.Hosting.Tracing.DualWriter. This class is used by OWIN to write all OWIN related data to the console.

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After removing the related tracelistener using the line of code below, I noticed that the test execution time returned back to normal:

Trace.Listeners.Remove("HostingTraceListener");

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