Optifine doesn't currently work with the latest Agrarian Skies+, I don't know if it's just with my client or something else. If anyone got Optifine working on their Agrarian Skies+ client mind helping me install it on my client.
You could possibly try moving all of the mods and configs into your .minecraft directory, but even then I get the impression that Optifine wouldn't work. It seems to be something to do with the FTB packs in general.
There is no reason for optifine in my opinion. It doesn't increase tps much with modded minecraft and causes render issues. Proper low vanilla settings give me about the same tps as optifine on its lowest settings. Edit: if I'm in a base with a lot of machines, outside in the wild is a place where optifine still does it job pretty well.
for me the same problem... try to use all the versions from 1.6.4 C2 to version 1.6.4 D1 can acess the server but when i try to go in my game my client crashes!
Cant wait for the IC2 devs to finish FastCraft. [WIP|1.7.10] FastCraft 1.6 - Off-Topic - IC² Forum its still WIP and for 1.7.10 but its looking good