Can I tweak the settings of my graphics card on my laptop?

I've been playing minecraft with close to 35 fps and heavy spikes when using bows or blocking with swords and I really want eliminate the spikes but increase overall fps. I'm playing on a gateway laptop with these specs. Amd radeon hd 6310 with 256 mb GSM, 2 GB ddr3 mem installed with amd dual core processor. I'm using opifine and only modloader. Im not too tech savy but know a bit to get by so I don't need too much detail but ANY help would be great! If anyone needs additional detail just let me know.