If you are referring to the "Build" section in application properties:
Name:  AppBuild.jpg
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I checked "Optimize Code", it made no difference at all...
I checked "Allow unsafe code", it made no difference
I unchecked "Define DEBUG constant", and "Define TRACE constant", again it made no difference

The only thing that made a TINY difference is when I executed "Start Without Debugging", it increased the frequency by ~50Hz, but still very irregular varying between 3.6 KHz to 5.04 KHz

Still a long way to go until it gets to the frequency reached using C in Raspbian, at 7MHz