I also am getting huge lag spikes. The menu is laggy to the point where it doesn't even register my mouse clicks half the time and in-game is even worse. I can move/look around for roughly 4 seconds before the lag takes over for the next 10. Walking around is totally out of the question, as that causes even more lag. I have no problems on a vanilla minecraft, and this problem has never occured on any other technic pack version. I have 2 gb of RAM allocated to it (using the options on the launcher) and millenaire disabled yet still there is lag.
My Specs:
Processor: AMD Athlon 64 X2 Dual Core Processor 5200+ 2.7GHz
RAM: 4.00GB (3.00 GB Usable)
Type: 32-bit Operating System
Windows Edtion: Windows 7 Professional SP1
Any help/suggestions would be great, I have been looking forward to Technic 6 forever.