Mine did this at first, after I put on the bug shield it got noticeably better. Last week, I switched the wiper blades for Neoform? I think they were called, from NAPA and now everything is crystal clear at any speed. We had a pretty good rain that turned to ice and snow, making driving just miserable and the wipers and windows stayed nice and clear.
Current Truck = white 2012 3500 Outdoorsman