Anyway, going into my Nvidia control-panel, opening up Starcraft II and selecting "Prefer maximum performance" for power management mode made my performance INFINITELY better.
I guess for some reason Nvidia software thinks Starcraft II isn't important and runs the card slowly. Ugh.
ymmv.
Edit: Ah seems like CPU is still screwing me over. Core-i5 doesnt have enough performance on 2 of its cores for SC II. Lowering effects and physics quality gives me a big performance boost under lots of action.
Please up your multicore Blizzard.