I was thinking it might be a good idea too split the 200 player seige server into two 100 player servers. This is because of performance issues not creating a good general experience once the server reaches 150-200 players. My biggest issue is my ping, not the fps, but I think for other people with mid-range computers they might have issues with fps aswell as with ping.
I am using the TCPOptimizer, and I get a steady 60 fps at 200 players. When the server is down to 100-130, I don't experience the ping issue.
Something you can think about, if you havn't already.
/Lord Aayy