Make sure you're running a dedicated server and not playing on the server,
that will really impact performance on your 'net game (although LAN it works
okay).
SERVERS
Set your BANDWIDTH LIMIT on the ded. server. This limit is your total allowed
bandwidth for your server. So, if you're on a DSL connection, you'd limit your
server to 256 kB/s.
CLIENTS
Set your connection type (under MULTIPLAYER>INTERNET) to reflect HOW you're
connecting to the 'net, or one step lower. If you're on a modem, don't have this
checked as a LAN...you won't enjoy the experience as much.