@a6ff0b2b With one user on an M1 MBP with 32GB of ram, I barely start to feel it around 180 TextEdit windows (in addition to about 20 others spread across several spaces). It definitely increases as I get closer to maxing out TextEdit's 275 windows.

The jumpiness while dragging close to another window is more apparent than the molasses feel. Rather than dragging through molasses, it seems more like it's just dropping frames for me. 

 @fb0d2ff3 Try two users!