Hiya Piotr.

Gave it to POV-Ray here to render and I only saw a 3X change in render times 
for the chrome and glass. I'm not sure what to suggest then, because that 
seems about right for glass objects.

Something I wanted to point out about your global_settings is that you 
aren't using assumed_gamma, something that has often been discussed in the 
past, so you might want to check into that. Using assumed_gamma 1 is said to 
be correct (unlike version 3.7 beta where that has now changed).

And for radiosity it is common practice to use ambient_light 0 to squelch 
the effect of ambience and apply to the diffuse of textures.

One other thing I noticed, your chrome has fresnel reflection but that's 
applied based on ior (refraction), yet it hasn't any refraction; although, 
you may add that if you wish.

-- 
Bob H  www.3digitaleyes.com
http://3digitaleyes.com/imagery/

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