Hello,
I am not exper on workings of the touch screen devices, but I might have an idea to improve touch pen and drawing responsivenes. As muc as I know, touch screen devices raster scan entire screen to find the location of the pen or the finger on the screen. I thought, this might be the couse of the slight drawing lag. May be, If device could scan a small rectangular area that adapting to the movement of the pen or finger; especially when it's fast, this would remove the lag.
