[Posting to newsgroup since other people may be interested]

Now that you sent me the files... The scene is quite slow to render 
(55pps) even without radiosity or photons. I tried with photons, and 
there were very long periods where the "photons shot" counter didn't 
change, which could mean POV-Ray is shooting lots of photons but 
"missing the object".

What I'm suspecting is that POV-Ray is creating sub-optimal bounding 
boxes. I see a lot of difference objects on your scene. POV-Ray 
sometimes does a bad job bounding difference/intersection CSG.

I'm now rendering a 160x120 image to see the raytrace statistics at the 
end, and see if there were a lot of misses or not. Stay tuned...

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