I have a procedural plugin that generates a lot of nurbs curve primitives (hair from another package). It works well and is very fast but the trouble is memory use; approximately 2G for ~800k hairs. With renderman I can use the RiCurves primitive to generate all the hairs at once. Could it be that there's overhead in generating 800k separate GU_PrimNURBCurve objects? Is there a hidden ‘multi-curve’ object that the fur plugin is calling under the covers?