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It is very slow to play, only 25-30 FPS. My screen is 60 FPS. After using "gms_scheduler_fix", it is stable at 30 FPS. But it is very fast to play. Is there any way to make it run at 60 FPS?

Not that I know of - Spelunky SD is based on the original Spelunky Classic 1.1 source code, which was programmed for running at 30fps specifically. You could force the game to run at 60fps, but everything will just move twice as fast.