joster and/or tebop have posted 4 or 5 links to vids at u-tube, if anybody wants to search here, and said users allow search.  all in preview mode IIRC. if using bvh, some of which can be ~1000 frames, speeds things up alot. if he's still using the same old mac, then rendering with ray-tracing and IDL may be out of the question.