Feed The Beast

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Usually my fps (with vsync on) is at around 60 fps but occasionally when i look in a certain direction it will drop to 30 fps, if i look away it goes up to 60 again, but if i look back again it drops...
This happens pretty often and i think most of the time it happens my automatic sieve farm is in the screen (sometimes behind wood slabs though).
Can somebody help me or tell me why this keeps happening?
Also i am using rivens "full" algorithm if that helps.