I think, that would be a good idea

This is not the problem, as I wrote above, with 57 materials, Octane responses very slow

Your GPU is quite slow though. I'd consider upgrading to a GTX400 series card if you want to do serious work...

Radiance :D For Beta and playing around it is fast enough ;)
Unfortunately my i860 has an ATI ...

This is not the problem, as I wrote above, with 57 materials, Octane responses very slow

Ok, the most important problem with Carrara is, that it exports a material for every single piece of the mesh,
so I have many duplicates of identical shaders. Is there any tool, wich can strip those duplicates out of .obj files?
(Otherwise I write it for myself)

Thanks for the fast response, with different export settings , it works, but with 57 shaders, the software responses very slow.
But I like Octane

Edit:
I use Carrara 7

This object consists of 57 parts with different shaders, but is loaded as a single mesh with one shader.
Do I something wrong ?
Or have I to load every single part as seperate mesh ?