We had our server on a hosting provider though Multiminecraft and Even still I was lagging, I Ran on tekkit and normal servers just fine, or even custom servers just fine, but FTB servers just kill my pc, I have tried everything I can think of, From reinstalling windows 7, to reinstalling java, to Upgrading windows 7 64bit to windows 8, Tried Optifine with and Without, Quard Core, with a nvidia g-force 550TI, Java 6 and java 7 both tested with both 32/64bit Offline versions
a few of my friends have this issue too, Tried increasing virtual memory, Tried increasing allocated ram, and still the game likes to "Stop and go, stop and go" and sometimes hard freezes, and this ONLY happens on FTB
Any help would be appreciated, but OP and the other person are not the only person having this issue.