I've done everything I could think of to make it work, but since the update I can't do anything. Even just one later, with no other apps open on my tablet and on airplane mode, it lags so badly I have no way of knowing if the line I'm placing will be in the right place. I can't at all continue a line after lifting my stylus because it won't be in the same spot.
The lines are also incredibly pixelated no matter what size canvas or own settings I use. I don't do anything complicated, I use sketch book just to do line art so I can print and watercolor it. Everything is fuzzy, I can't do any detail at all.