> Ray->Shape Intersection          Tests       Succeeded  Percentage
> Bounding Box              349230262435       540399421      0.15

> Do you see anything, which explains the looooong time?

I could be wrong, but 0.15 percentage of successful bounding box tests 
looks like a bounding problem to me. Apart from manual bounding, these 
are often caused by differences: Check the ones in your scene (you don't 
need many to slow things down a lot) and try to bound them manually. Or 
check if some methods/tips mentioned in the Holes Tutorial 
(http://www.econym.demon.co.uk/holetut/index.htm) help (render the image 
in a low resolution with no antialiasing to test these methods). The 
tutorial also explains what's the problem with differences in POV-Ray.

If none of that helps, I usually try to spot the problem by removing 
things from the scene step by step until I find out which objects slow 
the render down a lot. Once you found these, it's often a lot easier to 
pin down the problem.

HTH,
Florian
-- 
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