As for the fps, I still get a constant of 60 which is a great point but it would be even better if those annoying artifacts would be totaly
gone The shadows are great, no doubt about that but I still reckon that with out the use of conditionals, you would get a scene with better visual content thus without aliasing effects
I found an article which covers anti-aliasing through centroids, can be handy.

Cheers

Frazzle