Are people here aware that in almost any case the frame rate is one of the last thing that gets adressed during game development? I've seen hundreds of early-in-development games in my carrier, and 80% of them had shitty frame rate which eventually turned out to be either good or perfect. One of the latest example is Bioshock. Shitty sub-20 frame rate when I saw it in Boston last March. Awesome rocksolid 30fps game at E3. Plus, better everything, from lighting to textures.
Just stop this craziness. Factor 5 will deliver. On the technical side at least.