Bagginsbill, thanks for the timings.

Do you think the addition of shadows and/or raytracing would increase node calculation exponentially?

I'm guessing raytrace would but I don't think shadows would.
Hmm. What about AO?
Off to do some experimentation of my own...

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire