None. Just observe.
Using the Off Screen Drawing project I uploaded before, I used the inspiration from cpumaster930's hexatest project to make this improved hexatest, that doesn't have any pen rendering errors. Right now it's still a bit on the slow slide, and it flickers a lot - so that's what I want to fix. Edit (just a few minutes after sharing) - it seems I've fixed a lot of the slowness and flickering by using more custom blocks that run without screen fresh.
