[Mass FPS lag in Tekkit server]

I am running a private tekkit server with around 5 of my freinds. Even when I am alone online In certain chunks I get 1FPS and so does everyone else when I leave these chunks my frame rate jumps back up to around 200. This cant be a problem with my PC as its a i7 3770k 6GB ram and nvidea GTX 560.

Please help The server is unusable I have installed Anti-lag mods and there is no change. I rarely use build craft pipes so it isnt the entities.

PLEASE HELP!

Thanks for your help

Morgan

[When I log in with technic on 3.1.2 it says 'login failed']

Launcher Version: 3.1.2

Operating System: Windows 7 64 BIT

Java Version: Windows 7 Update 7 just updated

Antivirus Program: None

Description of Problem:

When I log in with technic on 3.1.2 it says 'login failed' I am connected to the internet and have restarted modem and PC and uninstalled all anti virus

Error Messages:

Unable to connect to minecraft.net would you like to run in ofline mode

Error Log:

Cant find it Sorry