Hi! I've noticed some strange behavior. When the image is zoomed out, painting and color picking becomes significantly laggy, so much that Krita is hard to use. I tried experimenting a little, and it seems it starts exactly at 50% zoom. The brush and its size don't matter. What could be the reason for such strange behavior? Is something specific happening at 50% zoom level that can cause lag on my computer? I'm using Krita 3.0.1.1 on Antergos.

Try turning off view->instant preview? It's actually supossed to make it smoother.

Thank you, that helped, there's no lag at all now! It seems that for some reason instant preview was very slow on my computer.