I clipped two tori using boxes instead of planes, and that alone decreased
render times by 12 to 15% (speed increase of 13 to 18%)!

I also messed around with various ways of slicing up the base of the object, but
the results ranged from marginal improvement to drastic slowdown, so I left that
alone.

The optimized code is attached.

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Download 'callwood-ikebana-csg-1.1.zip' (131 KB)