Actually, I haven't done any really ambitious renders yet, so that hasn't been an issue. And I'm not typical because I have Director, Photoshop, etc on my G3, and an old Mac Duo notebook that I usually have on, with a writing project, so I always have something to work on when one computer is tied up. And Bobasaur is probably right - you just know some of the grief folks are seeing is pure Windows! My Mac P4 never crashes either, whereas the PC regularly has the blue screen of death.