Look at your Task Manager, the processes tab. If no memory transfers are being done for about five minutes in the Adding Objects stage, the engine has gone in an infinite loop and will never come out of it. Only solution is killing the process. (So ALWAYS save before render!) The things that really slow down Firefly are very large shadow maps (4096x4096 took 8 hours on my - fast! - machine), volumetric lights (normal render time x10) and DOF (normal render time x5). If a P4 render runs in 30 minutes, the Firefly render (provided you don't use volumetrics or DOF) should also take about 30 minutes. If you use raytraced shadows instead of depth mapped shadows, Firefly should be faster.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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