So much lag with the watercolor! Do you know why that is, specifically?
The sites that The Wife uses to sell her work demand high resolution images of 12,000 to 20,000 pixels, and she likes working in watercolor - so we had to track down a more powerful computer with a decent graphics chip just for that. Even so, it can take a couple of seconds to render each brushstroke.
All the other media render in real time.
Yes that's sort of exactly what happens. At high rez with a large brush size in Corel it can lag behind by like a second because it is sort of calculating the "effect" that is applied to the brush. Its interesting because you can watch it spread right after you brush it on. Really cool effect that I want to learn more because I am sure when proficient you could male it look almost exactly like real water color.
It does look cool to watch. Like watching paint dry - but in a good way! The "Water Evaporation Simulator 2018."