besides physical RAM, you should also check your virtual memory settings. ideally you want to use a dedicated small hard disk just for virtual ram and could easily use 32-64 gb of hard drive space purely for virtual memory. also what is your graphics card ? that also plays a good role is Mudbox performance.
I'll look into virtual ram sometime today. I don't have to work. I also realized by accident that I'm using a 64-bit operating system and a 32-bit Mudbox software. I installed this a couple years ago not thinking about it. Install ed the 64-bit version this morning and I'm sitting at 12 million polygons no problem. Didn't…