Still, I think it’s the best (or least worst?) option to make high quality renderings that do not take a loooong time to do. and most Rhino rendering features are not compatible with Octane. There’s also no materials library, no samples scenes, no easy-way-in. The integration is not good (rendered viewport and octane appearance only barely match in only some types of materials, but it’s still improving lately). I’m not sure if technically is even possible to eliminate cashing completely, but that would be nice. Never versions are trying to speed up cashing so that will get better. So what should take a couple of hours to render can take 5X that. In complex scenes that geometry cashing takes longer that the frame renderings. Not only Octane is not real-time, In fact if you are trying to render an animation in Octane you will have to add to the render time of each frame, the geometry cashing time too. McNeel will probably never make a library for it, so you will have to invest time to make your own. Also in V7 there is now support for PRB materials in rendered viewport as of last month. The only realtime options in Rhino right now are the shaded and rendered viewports.

You are talking about two different things here:

Octane render for rhino