The monitor refresh is 75Hz. Of course, frame rate would drop if i add something more moving than a circle and few lines. I don't need 400 anyways, but i would like to have around 100. I did not add Vsync. In Counter-Strike Source, my frame rate is 80-300, depending on a lot of things, in fastest case above 300. I don't see see the refresh, which is above 75Hz, but higher FPS decreases delay- Faster program reaction time.
The only slow thing here, is an almost full screen blit, at a 32bit depth.
I am not worried about the performance of the game- it runs great, I just don't understand the phenomenon.
About video card refresh limit: where can it be, I tried but didn't find it.(Nvidia driver, pretty new..) Also, i am sure i didn't touch it.
The number is 63, I am sure. It calculates frame rate taking average of 10 frames.