camera movement is choppy. never had this problem before recently (it might have cropped up with the recent-ish update to "little big adventure 2 classic"). I'm on win10 and I've never had this problem in the past (on this machine or on any other)

By choppy you mean a bit laggy when the camera moves to the next scene while being outdoors (isometric indoor environment is fine)? If so then I got the exact same problem – on Mac though. I too guess it came with the new "classic update".

On Windows 10 there's absolutely no problem at all – same for the Steam version.