I have always experienced slow touch screen response with my 2015 85D and I though that is normal, until I drove a 85 loaner (not sure which year but presumably older than mine as it has a low-res touch screen) that was much smoother .. This makes me wonder if the lag is normal after all! Just to give a couple of examples: 1. Turning the AC up/down sometimes takes ~2 seconds to respond, especially while driving. 2. While driving, it is almost impossible to scroll through Nav history. It is so laggy that my scroll will almost always register as a 'click' and reset navigation to which ever address I touched first (This is very annoying..) 3. Switching items on the dashboard feels like there are only 3 frames in each animation I vaguely remember it was smoother before but I'm not so sure anymore. I forget, has there been any change in the computer hardware in the past? How does your touch screen respond?