FPS drop when in inventory, chests etc.

[Munda]

I've been playing Tekkit on my own server for a few days now, and I keep getting huge FPS drops, like down to 1-5 fps when I open a chest, or a crafting table or my inventory, or just when I look in a certain direction, but then it sometimes goes away on its own, or if I face a different way when I open a chest or machine interface. I don't have any crazy machines or anything, the only real thing I've build so far is a solar panel factory, and it's not even that big.

Aside from a small quarry nearby, this is all I have on my server.

Does anyone know what could be causing this?

It's just me on the server btw, hosted on my own machine. i5 2500k, nvidia 560 ti, 8 gb of RAM.

[myight]

Yea same thing for me ive been playing technic 7.5 for awile now and now any thing i do i menues my frames drop too nothing and its only on the one save if i start a new world its fine..