I have a i7 processor, 8 gigs of ram, and a geforce gtx 570..and run battlefield 3 just fine
then i get to minecraft and my computer is about to **** a brick. It's almost acting like its the processor or the ram because the game is unplayably stuttery. I could play it fine for a bit, but then I resized my window to be bigger and that brought it back to a screaching hault
messing with the settings helped a bit but not enough, and i dont even think i should need to mess with the settings in the first place.
Once i leave the game and get to the menu it runs totally fine, so its not like my processor is bogged down by other things