Upgrading computer

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So my render distance is at 9 chunks and I have allocated 6 gb to it and it use about 60-70% from looking at it


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6gb is way too much, that could explain your drops in fps. Too much ram causes java's garbage collection to crap all over itself and ruin performance.

Try 2gb.
 
2-3gb is optimal. 60-70% usage is fine. I would start at 2 and play it for a while, and see where your fps averages.

also make sure you're running fastcraft, not sure if those packs you play come with it installed.