Exactly the same problem for me on Mac (Big Sur, DisplayLink Manager 1.3.0) - one of my screens is rotated 90 degrees, and it has a very laggy / slow performance when moving the mouse pointer over it, and especially when dragging / resizing windows and switching between desktops.
It's actually pretty unbearable / unworkable. I'm thinking of switching back to just using direct connection to my laptop..
Exactly the same problem for me on Mac (Big Sur, DisplayLink Manager 1.3.0) - one of my screens is rotated 90 degrees, and it has a very laggy / slow performance when moving the mouse pointer over it, and especially when dragging / resizing windows and switching between desktops.
It's actually pretty unbearable / unworkable. I'm thinking of switching back to just using direct connection to my laptop..