>has a way to flip between spaces on MacOS that has very low delay

Lol the way it seems to do this is by simulating swiping on the trackpad really hard. I.e. create a synthetic CGEvent with the undocumented but well-known fields set to treat it as a fluid swipe event, then just put a large number in the swipe amount.

See e.g. https://github.com/thenickdude/wacom-driver-fix/blob/bdfda9a... for context.