I've just installed Corel Painter X.1 and am going through tweaking the application and customizing brushes. I am having a problem with the scratchboard tool.

When the brush size is small it seems to run fine, but when the brush size is jacked up anything 100+ strokes lag considerably.

I'm running an Intel Core Duo 2GHz with 2Gb RAM.

Has anyone encountered this? If so, how did you fix it, or overcome it?