Figuring this to be a good example for POV's histogram feature I gave it a
try. Been a while since I had done one of these. You can see that the most
calculation intensive parts seem to be occuring at the shadow edges. What I
was expecting to find instead was a bright spot where the top of the dome
meets the part atop it, since that's where I notice the most slowdown occur.
Or so it appears to me as I watch the rendering take place.

This image was doubled in size from original, no radiosity and no AA was
done. I also changed contrast in the post process so it would show better.
Oh, and it is a pixel by pixel histogram, not one of blocks of pixels.

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