> Please tell me why this scene renders faster. You have changed quite a bit
> so I can't quite pinpoint it. I'd like to know as this ol' thinkpad isn't
> that fast.

I think it's because I removed an extra union, POV can automatically
split the bounding of objects in a union efficiently, resulting in fewer
ray intersection tests against the bounding boxes. When you have
unions inside of unions then you end up with extra bounding boxes.

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