This is a wide open question. It could be a techincal issue: your frame rate is too low, the internal video system (if it's IP based) could be running the video at too low a frame rate, etc... or it could be an animation/artistic issue: your animation needs to have more time between points for the chosen frame rate for smoother motion, etc... Is the perceived motion problem occuring in Carrara? Could be a problem with your chosen frame rate. (video should be set to 30FPS) Within Premiere? Could be a problem with your computer not being able to play the video smoothly from the timeline because of a codec issue, or speed of your hard disk. Or, after being played through your internal video system? Frame buffer issues in an IP-based system. Give us more info and maybe we can help. :>