I'm afraid I can't be much help. There are several users - including myself - who are struggling with ArtRage and Sonoma.
Here are a few desperate suggestions:
1. Make sure all other graphic apps are shut down.
2. Make sure 'multithreading is toggled 'off'. <Edit><preferences><advanced preferences>
3. If you're using a tablet, make sure the drivers are up-to-date
4. Call a shaman and sacrifice a chicken (just kidding!)
Other than that I can offer nothing except sympathy :-(
Brett
"You do not suffer because things are impermanent. You suffer because things are impermanent and you think they are permanent." ~ Thich Nhat Hanh
Tech stuff: 24" iMac M1: Wacom Intuos Pro L: iPad Pro 12.9"