Thanks for the insight OSTexo,

Yes, I could tell that Lux employed some of the same techniques as Thea, such as MLT and BiPT.
I'm not sure if there are any major fundamental differences between Kerkythea and Thea Render, besides the engine.

GPU use would be nice, I have a GeForce 6600 and the slots on the board to set up and SLI. At least MoI runs decently.
(..that is, once I asked for "tripple buffering" for IE in the NVidia console.)