Setting AlternateSyncMethod=1 moves the cap to 144 but also speeds everything up to the point it’s unplayable. Lowest dip I saw is ~75 when getting really hectic. It matches the refresh rate, so switching to 60Hz caps to 60. So my workaround is keeping 144Hz and using RTSS to cap to 60.
Clicks seem to register fine at 144 FPS but capped at 60 with RTSS I can pretty consistently make it fail. Try tapping single shots yourself, maybe my mouse is failing or RTSS cap is not ideal still. Oh, I see the cursor changing when clicking but the shot isn’t fired. Autocannon not rotary.
With AlternateSyncMethod=0, tried single monitor, 50-60-72-120-144Hz, all cap at 45. Maybe a Game Maker quirk, I don’t use it or I’d have run into it.