Hi i have this VPS server:
HDD: 120 GB
RAM 4096 MB
Proc.: ~7 GHz
Bandwidth unlimited
Internet: 100 Mbps
OS: Debian 6
I have 2 servers.
1 server is DeathRun with 57 plugins and 15-25Players
2 server is Public with ~30plugins and 5-7Players
Proc. from ps x ssh command
Proc. from htop tool

In deathrun server i feel lag. Whit 15 players is good. Players ping is 20-50. BUT Whit 20 and more all players pings up to 100-200MS. And i dont know what to do. Any help?
Sorry for me bad english!