Depends on how much contrast there is in the scene. The Normal Mode does an Anti-Aliasing pass last, which is just an image (2D) blur effect which averages out highly contrasted pixels (the jaggies). If adjacent pixels don't need it Bryce skips it, so it's very fast but it can blur fine contrasting lines out of existence. The Premium modes shoots so many rays per pixels that an AA pass is not needed. For a scene with a whole lot of contrasting pixels 16 RPP is actually faster and looks "crisper". For all the render effects 16RPP is almost always faster then AA mode (cause they add contrasting pixels). As TJohn says, neither 16RPP or AA looks too good for render effects. Best; Dan www.bryceworks.com