When changing viewports in Maya I get really bad slow down. I may start with the perpective port on full, once I change from full view, to four screen, then back to perpective the display becomes very hard to manipulate. Strangely though if I change, say, the side viewport to Perspective then enlarge this the display works normally again. I have a GForce 2 GTS as do most of my colleagues yet they do not experience this problem. Any thoughts would be appreciated. Thanks.