Let me add a little bit to this: the factor of two (or more) is for one
particular scene--the classic floating glass sphere--but I'm only seeing the
improvement with 3.6.2. Another scene shows no such 64-bit improvement. And it's
not photons--the large factor is there with or without. But I'm not seeing
anything like that 64-bit advantage in 3.7: just 10%, or so.

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