My video card drivers are up to date. I don't have any Wacom drivers, but the Razer Blade 2014 has a touchscreen which might have similar drivers.
I'd heard touchscreens might be supported in CC 2014, but it looks like only for pinch zooming as an experimental feature - I can't draw with the touchscreen at all. Is it possible this is a bug, maybe related to my lag? In comparison, MS Paint does touchscreen drawing very well.