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cgminer times how long it takes for the gpu code to "return" after it's been given work. Unfortunately with windows, the timer resolution is so shithouse at 15ms that I have to sample many many iterations of the GPU code and then average them to see how long it took.
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cklovias, there are several ways to overcome this drawback of the simple windows time functions. Probably the two easiest ways are using the code from this explanation
http://msdn.microsoft.com/en-us/magazine/cc163996.aspx, or by using the .Net stopwatch class (for your code, you would have to call into a c++/cli dll wrapper around the class, then you have to deal with people needing the .Net framework installed too...maybe make it optional?)
I like using dynamic on my main windows computer, but I have been sticking with 2.7.5 because it has better dynamic behaviour for me. I have just been thinking, 'oh well, make it until the ASICs come out and that's good enough!'