you'll fine I believe that the Vue Infinite will be much faster.. not sure but Pro isn't mac/multi processor aware.. so you're only using 1/2 the power, I could be wrong... if someone else knows please butt in :) I'm only using Vue 5 and it is slow compared to programs like Carrara which is WAY faster rendering, they have a nice plant & terrain with carrara but still nothing like Vue's render farms are a good answer.. get a bunch of $50 PC's and/or Macs and just stick them in some room somwhere. I use Vue a lot for animations by just rendering one big image for a background then using it as an alpha plane or background in Carrara which has a little bit better and WAY faster render engine. just a thought for ya :)

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Hexagon, Carrara, Sculptris, and recently Sketchup.