Howdy --

New Mac, New Version of Carrara, New Problems!

So, here's the deal.

If I render a scene in Carrara using multi-core rendering (with "Enable Multi Threading" ticked in the Rendering tab in the Rendering Room), the scene will render significantly slower than it renders with a single core ("Enable Multi Threaing" not ticked in the Rendering tab). 

I say again:  using multi-core rendering is rendering significantly slower than using single core rendering.

AND this is happening in Carrara 5.1 Pro on a G5 quadcore using Tiger, and in Carrara 6.03 Pro, on a BRAND SPANKING NEW MacPro Octo-Core using Leopard.

On the Daz forums I see that Kix has posted a benchmark test and it seems that other folks are having this same issue.

Why would this be?  Is there any way I can get Carrara to actually take advantage of this screaming new machine?  (Or for that matter, the screaming old quadcore?)  Is it just a Mac thing?  Did Eovia (and now Daz) release a substandard build on the Mac?  Or is it something that appears on PCs as well?

Anyone have any ideas? 

Thanks!
Dex