Okay so I'm at a bit of a loss here. I'm running a private FTB DW20 1.6.4 server for a group of friends, and for some reason the terminal keeps giving me a Can't keep up error. On top of that the server tends to lag on and off quite a bit. I'm currently running the server on a 2.33 quad core with 10 gigs of ram on debian wheezy. Dose anybody know how I can correct these issues?