Of course it's pointless to draw nothing. The framerates are still
respectable when drawing stuff. SDL drops to about 40 or 50, OpenGL to
60-120 depending on the render method.
One's eyes "refresh" at about 12 fps, so anything faster than that looks
fluid. The amount of smoothness, of course, is dependent on the framerate
of the screen. 12fps vs. 40fps is a big difference. After about 60, most
people can't tell any increase. I don't care if I can't see it. It is
still cool to know that your computer is doing that.
Ian
