I've got my new MacBook Air a few days ago and installed BTT 3.553 (1693). I only set up window snapping and a 4-finger-tap gesture, but the problems as described in the original post are still there.
The Finder hangs a lot of times, I move my finger but the pointer stays where it is and in some Apps the pointer is reacting very laggy. In this case I tried it with Wonderdraft (Rosetta), not sure which other Apps are affected or if this is specific to Rosetta. On my Intel Mac I don't have these problems.
I've recorded the behavior on my machine. On the video it's less visible than in reality, but I think you can see what I mean.
https://www.dropbox.com/s/b2nuyfmkx2aa4e4/btt_laggy_m1.mov?dl=0