What is the best possible resolution that C# timing tests can get?
milliseconds? nanoseconds?

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Well, I'm not sure what C# has to do with it - especially since this
is a VB.NET group.... But, probably the best class to use for timing
code and such is System.Diagnostics.StopWatch. I believe this class
wraps QueryPerformanceFrequency and QueryPerformanceCounter API's -
which on most hardware should give millisecond resolution.

--
Tom Shelton

However,

As addition to Tom, has to be done more times on Windows Operating systemst,
because there is mostly a lot of processing in the background, even if you
did not start that yourself.

Therefore the results are very insecure even in milliseconds.

Cor