Yeah, Indi's right. Scientists did an experiment, and for a sim, 60 fps are required to fool your subcontious mind. Today's <standard> movie's are based at 29.97 fps, but as Indi said, the frames are smoothed. It is with a TV that you don't notice higher than 30 fps, but not so with computers. Personally, I aim for at least 35 fps, and most of the time, my '07 iMac can keep those frames running pretty fast at very high res and 65 degrees FOV. Happy landings - Jason