Hello. Was having lag problem. Tried a bunch of things, in Preference panel,  Performance all that stuff. Last thing I tried that helped was, when you are on the brush tool, on the top bar, you have: Home (icon house), brush, size, brush folder, Mode, Opacity, Flow, Smoothing....right after Smoothing, there is a Gear icon. Click Gear: Un-click all except "Catch-up on Stroke End". That helped me. Cheers!! ... View more

Hello! Found this in another post: Does turning on Window > Application Frame help? Worked for me. It was driving me nuts!! ... View more