Minecraft lag despite my gtx 670?

So I just built a new desktop computer, I have an intel i7 quad core, the 3770k, and an NVIDIA gtx 670 2gb vram. I can run battlefield 3 on ult with 70-80 fps no problem, but for somereason when I run minecraft, and I move around quickly I constantly find myself waiting for chunks to be rendered, I would think I should mever see blackness ever as low quality the graphics are on this awesome game lol

so what gives why does it run so slow? especially when I crank the render distance to extreme using optifine and spoutcraft and such,

also, when I am running minecraft, I never see my gpu go above 20% which could explain the slow rendering and fps, so why does it do this how can I fix it? I want to be able to crank up 10x speed on super view distance and see it all load instantly.

odly enough though, when I stop moving in game, just let it sit there, my gpu meter shoots up to 70% but as soon as i move my character it goes back down to 5%?

thanks.
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More about minecraft
  1. + update java if u havent
  2. Add more ram to minecraft.
  3. Minecraft tends to run slow on high end or low end machines.
    Here's a few tricks to run it a bit more faster.
    http://forums.multiplay.co.uk/minecraft/78772-tips-increasing-minecraft-performance
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