Sounds like you have more than many artists have here put together. What's slowing you down is most likely to be the textures you are using. If you are simply setting up a scene in Bryce, try rendering without textures at first till u get the scene that way you want it. Use a low rez (AA or default) setting and lose things like soft shadows and true ambience. Finally, change the nano-preview to wireframe view. That should speed things up no end. Of course, others will have their own ideas but this works for me.

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...