I don't recognise that version of PovRay. Is it possible that you're
using something like MegaPov? That might be significant.

It's also possible that the way you've clumped the triangles into
objects happens to interfere with the automatic bounding process, and
leads to less efficient bounding. E.g. if your "objects" were generated
by choosing 100 random triangles from the set of 5000, then each object
would have its own bounding octree that spanned the whole scene.

The stats suggest that the two renders are not exactly equivalent. One
of them has a few rays that get totally internally reflected, and the
other one doesn't. That might be because your objects have a different
"inside" than the individual triangles that compose them. Or it might be
because there's something else slightly different in your scenes that
you're not telling us about.
-- 
Mike Williams
Gentleman of Leisure

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