As it stands right now the server is built to the maximum specifications that an FL Server can take advantage of without waste.
Though if you have any suggestions I'm sure Majkp and Korrd would be more than willing to listen.
i'm not sure how much help I could be, as I've only hosted a FL server for a buddy of mine and me, and even on my comp, it was laggy, and that's with 4.84. though, i'm not sure if it'd be possible to get more bandwith, that may be able to help a bit. would have to check:)i think part of the lag issue, is where everyone is connecting from, country/city wise.