I've completed 1 game with this beta. It was a 10 player, 1 star, FFA, with the AI players set to hard.
It played out pretty well, and I monitored my ram/cpu usage, and things seemed to work quite well.
However, I started a 10 player, 5 team, HUGE multistar game, with all AI set to UNFAIR, and the game ground to a standstill at about 2 hours into the game. The CPU usage was fine at about 75% or so, but my FPS was 20 or so (playable) at 1x speed.
At 2x speed, the FPS was about 4 frames. (unplayable) Basically a slideshow.
My system specs are:
nVidia460GTX1gb Drivers: 260.99
It should be MUCH better with my system specs. I wonder, though, if the poor FPS has something to do with the multi-star system...?