Good news!! there are signifigant Speed improvements in the render engine of Bryce 5 Using the standard "Normal antialias" render option and "Volumetric atmosphere renders" Bad News!!: the new Render features that make this new version so appealing ie.Soft shadows, Depth of field, blurry reflections etc . are the new CPU killers that will give complex Scenes unmanagable render times( days!!) on a single machine. however for those who own multiple machines you can farm these long renders out Using "Bryce Client"