Thanks for the info, Praxis. I expect a long wait with FF in production mode. But my problem is it's so sloooow even in draft, with nothing turned on. This makes the FF renderer unuseable, as I often make draft renders to check my progress. On the bright side, though, I was able to work in P5 for an hour and a half before lockup. That's a huge improvement for me. Course, I didn't use any hair, collision detection, or any of the new features. Maybe that's why.