Martial what video card are you using? I'm shocked to hear you are having speed performance issues. The speed of Carrara is one reason I choose it over other applications. I have a much slower system. AMD 2000+ 1 gig ddr, but I have a 128mb video card. I'm not sure what you have, but this could be issues with your video card. Also CS4 is a HUGE increase in OpenGL and Software rendering performance. I can actually play bone animations in realtime in CS4. Its almost like working in Motionbuilder. Brian