Slow Performance on Good PC? Any Tips to Improve Performance?

Hey, I just got Corel Painter 2019 but I'm finding the program very laggy despite having a relatively high end PC that can run much more intensive things (Geforce RTX 2060, Ryzen 5 3600, 16GB RAM). The worst lag is when resizing brushes using shortcuts, every time I want to simply resize my brush it pauses and gives me the 'processing' icon which slows drawing down to a snail pace since I resize it all the time. The UI is also just generally quite laggy and unresponsive when using any of the tools, switching between them etc. Right now my settings are for it to use 80% memory and 6 CPU cores.

Does anyone have any tips on how to improve performance on the program?