Okay.
Using indirect lighting?
I can't even move the mouse anymore, it lags my machine so much. (1gb SLI Nvidia cards, 5gb system RAM, AMD Phenom. Not exactly a slow system.)

Gonna have to work out how to do the GI part still, but so far I've crashed twice, I ended up crashing it on purpose the third time, because I couldn't do anything anymore on this box because I ticked indirect lighting...
Results so far?
Nil.

Silke