Staggered freezing in singleplayer

Put the summary of the bug you're having here
About every 30 seconds a slight freeze happens well I am in game on single player, what happens is the blocks will not respond with the game. I can mine but i wont receive a block, after the freeze the block I mined is invisible but whenever I hit the area it was in the block is still there. What I have to do is replace the same block i destroyed and mine it again. What I did find out is it worked fine on my friends windows 8 laptop.. odd
*What I expected to happen was that something was wrong with my computer, but after a thorough exam I realized there was a bug with the game

I thought the game wouldn't freeze

*What actually happened was the game froze
Describe what happened here
^{at top}

Steps to Reproduce:
1. Log onto Minecraft version 14w28b
2. Start a "Customized World"
3. Play for a while and the bug should happen