Vue Infinate is a decent speed renderer. It is multitreaded which is nice. One thing I do notice about it, is it is a memory hog compared to both Bryce and Lightwave 3D. I got a copy of it when I picked up Lightwave. They had some deal going on for both being packaged together. It sucks RAM bad though with just one fairly complex figure in the scene. Bryce seems to handle loads of models with no problems, it's just that your render times really shoot up.