The slow down is in the modeling room. When I want to move the camera and all the objects. I work everyting in wireframe (or even boxes) 'cause I know that the live preview is kind of slow with many objects. The rendering process itself is kind of slow. But I expect that beacuse I have a lot of reflections in my scene. I turned the number of reflections to 4 (instead of the default 8) and I think that helps . Does anybody work with a G4? what is your opiniion of Carrara's speed there. Thanks for the tip on the book. I'll check it out in Amazon