podcat said:to try and narrow down the problem place mouse cursor over an area of the bottom bar where you get no tooltips (this is important) and scroll the map using the keyboard. do you see a change in lag?
Yes, I noticed a big difference in fact no lag at all horizontally when placing the mouse cursor at the bottom or top of the screen and had no lag vertically at all. Also, I noticed that turning off the terrain map and using any of the others also reduced the lag although didn't get rid of it completely when moving left to right or right to left horizontally.