Hello, I was testing out the third 3.1 beta and, while everything else was fine, drawing had lag to it and the lines were pretty jagged, with any stabiliser option.
I also have a Wacom Intuos and the problem is still there. All of the drivers are up to date.
I filed a bug but in case it's my fault, I might as well ask here.
My system is the 2015 Retina 13" MacBook Pro with MacOS Sierra.

Solution: My display has been set to "scaled" in system preferences and the resolution was over 1440 x 900. When it's over that value, the performance in Krita is worse (I somehow neglected my display resolution). I set it back to 1440 x 900 and it works like a charm.