Hello

I'm an admin from the Australian NS2 community at AusNS2.org helping oversee both the public and competitive AusNS2 communities that play this game.

I think it's great that you guys have taken an interest in hosting a server for the game, but it is seriously under-performing and causes an 'interesting' experience, especially at a sale period when there are many new players coming into the game.

http://ns2servers.devicenull.org/servers/1400391/203.97.27.203:27015

If you have a look at this link, you will see performance graphs for recent play on this server. Pretty much anything under 28-30 ticks is unacceptable to play on and turns into a bad experience for the player. High performing servers barely drop from that, even in the late game where entity counts are high. 

Now of course, I can't tell you what to do with your servers, and I know this game has hefty requirements for both server and client, but I can recommend the player count be lowered to 16 or 18 players or putting the server on a box with beefier hardware. Typically it is single core CPU performance that affects a server primarily.

Thanks for the consideration in advance.