I was informed by a memeber from this forum about the ToSubD command hidden in Rhino 6 and so far I have been loving it. But there is just one tricky thing regarding the tool: it generates too many meshs and nurbs surfaces! And would dramatically slow down or even crash the program.
This problem also applies to weaverbird, especially when the shape becomes somewhat complicated. I just feel there has to be a way to reduce the needed amount of mesh when it comes to subd, or a way to merge all the Nurbs surfaces once the transformation is completed.