Been using BTT on MBPs for 4+ years. Primarily use it for a custom input on the touchpad to control audio up audio down via pinch out and pinch in gestures. Also use it to open new tab on 3-finger click. Running developer program for OSX, currently on latest 11.5 big sur beta.
With the latest BTT update, and even the newest alpha, whenever i use the pinch out or pinch in, it still controls volume, but the action instantly freezes the computer for about a half second before it registers. This is especially noticeable when watching videos (youtube) as the entire movie will stop, then resume as the volume up/down command is triggered.