Hi, can confirm. I have MMB for Pan and RMB for Rotate, the lag is there. It's comparatively more pronounced when using Shift key as a modifier.
To define what I mean by lag, it's like Acara says, moving the mouse X amount of distance before the Pan/Rotate starts.
This distance also depends on the speed of the movement. Move mouse slowly, and the cursor crosses half the screen with no Pan/Rotate registered.
A fast flick, and it rotates.
This behaviour is not natural imo, and feels very odd.
I purchased the Spacemouse Enterprise + CadMouse, and using the regular mouse now feels like torture haha.
I'd also love if the Spacemouse could recognise Alibre commands, the commands have to be entered as Macros and have the default Icon for everything.