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(2 edits)

It must be a gamemaker bug that happens with 144Hz displays. Press Page Up in gameplay to show FPS, if it doubled (120 FPS intead of 60) then this is the case. Try using fix, turn V-sync on, press Cntrl+Alt+F2, also some people report that alt-tabbing helps.

That's probably it, I'm running on a 144Hz display. I'll see if that fixes it.