FTB Infinity very laggy.

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It is in beta...so there might be a mod with memory leaks...keep an eye on your usage and try restarting to clear the leaks
 
Huh...FastCraft already in?

Maybe OP have allocated too much RAM for Minecraft?
It was disabled on the initial release due to the mod creators rules about distribution with modpacks and you had to enable it. Since then, FTB either got permission or Player changed his rules on how it can be distributed.
 
Skipped ticks are an AE2 problem as far as I can tell. An interface with a crafting card set to keep a stock of something it can't craft does it. There's another cause that I haven't been able to track down yet though. I THINK it has something to do with the storage code checking inventories as I'm using a lot of barrels instead of drives.

But yeah, this is a major major bug in AE2. I'm getting in on a single player server running on a Xeon 3.4ghz dual core with 2gb of ram. Has nothing to do with your hardware.