ok, this definitelly worked for me. im brand new to the game... but i remembered, on minecraft, there is a .. bug... that prevents the game from running smoothly on certain dual or multicore processors. so what you have to do is...
step 0: run the game
step 1: ctrl+alt+delete into your task manager.
step 2: go to your processes
step 3: right click "javaw" and click affinity.
step 4: disable all cores except for one. (i use 'core 0' or, '0')
step 5: right click javaw again, and mouseover "priority" then hit "high".
you will have to repeat this process every time you start up the game.
now, im not saying this will work for everybody, but it DID work for me. please let me know if it works for you, and if so, maybe we can get it stickied, or the developer can figure out a work-around based on this new info. (like i said, im new, so maybe this has been suggested in the past?)
edit::
seems it doesent fix it 100%, upon further play... but it does help alot.