Right now, I'm working on a scene containing 4 paddlewheel riverboats each with a polygon count of about 140000 as they were 3ds files (and each with different textures), a seawater shader by bagginsbill, 1 square with texture, 1 IBL light and 1 infinate light, 16 smoke props and 4 steam props. So far, Poser 7 isn't giving me any problems at all and renders this scene faster than Poser 6 does. And, I'm not through with it yet.