If you have any idea how this can be resolved, I have three more stars with your name on it. I’m running High Sierra on a mid-2012 i5 PC, 4gb of RAM and an SSD, and I’m using a Cintiq for drawing. I’m a bit of a luddite, but my other design suite and even video editing software run perfectly fine and I’d imagine they’d be more taxing on memory. I’ve even done a clean install of High Sierra and the problem persists.
I’ve followed all the suggestions in the fora - resetting to factory default, turning off enable rotate, brush stamp, etc, restoring, reinstalling and trying old versions of the Cintiq software - no dice. The brushes lag, particularly the larger ones.
This version (8.6.1) seems to have dropped the ball on responsiveness and the knock-on is a pretty frustrasting experience throughout. I’m a storyboard artist and the previous releases have all been perfect for what I do - fast and responsive. I’ve used them in studio and home environments and I’ve yet to find another program that matches Sketchbook’s usability, elegance and friendly feel. I’ve been a big fan of the previous releases since the beginning.