Fast tps drop??

[haxir]

So as expected I was going to have 50+ people on the server during launch day. The problem is my server is lagging really hard and im just at a dead end when it comes to figuring out why,

Here are the specs

E3-1230v2 (3.3Ghz Quad Core + HT}

)4x)8GB DDR3-1066 4R*8 REG ECC

1GBPS Connection (around 100down 70up when tested with speedtest.net)

The Usual resource usage

cpu = %20

Ram = %35

used to be running windows server but as of today its running ubuntu but the tps seems to be droping to 4 or 5.

I understand it could be the modpack but why would some other servers be doing just fine? I dont understand how other servers are keeping up with more than 30 + people.

Anyone got any clues how to keep that tps up and stop the tp, spawn and login lag.

[craziemousie]

what is in your serverStart.sh file?

are you positive your ubuntu is 64bit and java is 64bit?