@pascal I think it would be a great benefit if Rhino could be more cursor movement sensitive when snapping to large meshes.
Right now we are working with an imported arc model with lots of cladding and when I try to vertex snap it can be really slow to move the cursor over the model as Rhino tries to find the snap for all the cursor positions along the way.
(Hope that long sentence makes sense
So if Rhino could check the cursor position while looking for potential snaps and break the search if it has moved x pixles away from when Rhino started the search (say 30 checks a second) we should be able to smoothly move the cursor over the model when trying to draw a curve while vertex snaps are on. As it is now I get up to 3 seconds lags and since I use the icon to start the polyline I have to move the cursor back over the model and, well I guess you see the problem.
(the workaround is to type polyline with the cursor in the right position, but still it is slow to move it to the destination)