I worked with Bryce 7 last year and rendering a short animated scene at like 20 seconds at 15 FPS with era appropriate resolution still took around 40-50 minutes or so.
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Was the renderer still CPU-bound, maybe?

(That rocks, BTW, is the project/scene in question up anywhere?)
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It must be. My renders also take like an hour to finish.
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Yes here it is. I also couldn't make it seamlessly loop, in spite of using integer multiples for the transform keyframes on the clouds and whatnot. I "solved" it by rendering 2 camera passes from different angles and just perpetually crossfaded between them later.
www.youtube.com/watch?v=W82QT7B5BJg
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