Attached Link: http://www.renderosity.com/messages.ez?ForumID=106&Form.ShowMessage=1989480

Ikercito, GI renders with bump take a long time to render in any software and Carrara is no exception - it's very complex mathmatically. It simply makes Carrara do ten times the mathmatics to figure out diffusion directions and color transfer. When you add transparency masks, like with the Poser Hair, You can really make Carrara work. To avoid long render times on my GI renders, I will usually deactivate the bump channel on most objects that aren't close to the camera. Instead, I'll move the bump maps into the Shininess and Highlight channels and ajdust to fake a bump look. Also, nicholas86 is correct in suggesting a second look at your texture map resolutions. The greater the resolution, even if the object that has it is a long way from the camera, the more carefully Carrara will calculate light effects. The attached link shows how to think about resolution of texture maps. Try to avoid bump on transparent objects too. Instead, imitate it with highlight, shininess and reflection if you can. Otherwise, hair will simply take a little while. Saving multiple texture map resolutions takes a little time, but it is easily made up for in rendering time saved.