Been playing the game on my new MacBook Air (2.16 Ghz Dualcore / 4 GB RAM) in Firefox. Within half an hour of play time ram usage in firefox rises from 200 MB to 1 GB, and soon it will reach 1.5 GB and 2 GB! Is this just default Flash stuff or could the game be optimized? It makes it run real slow here and requires a browser reboot.