Space-switching lags when app is fullscreen on other display
I recently switched to a 14" M1 Max with 64GB of RAM and noticed something rather strange, that I didn't have on my M1 Max 32GB model.
Setup was and is as follows:
M1 connected by USB-C to a Samsung LC34 screen (3440x1440).
Since I got the new Mac running, whenever I set an app to fullscreen on the Mac itself, I get extremely laggy visuals when switching spaces on the big external screen. Sometimes even the mouse lags terribly for a few seconds. As soon as I end fullscreen, everything is smooth again.
Has anyone stumbled across this before? As it wasn't there on my "old" M1 I suppose (read: hope) it must be some kind of setting I'm missing.
MacBook Pro Apple Silicon