In the end [standupmaths] makes it easy to see why the least worst decision was to derate the refresh speed slightly from 30 fps. Given the constraints they were working with, that fact that NTSC ...

NTSC games on the PS1 typically run at 30–60 frames per second (FPS), but PAL versions only run at 25-50 FPS. This small difference in frame rate can have a significant impact on a game's ...