Hello, I have lag problem in single player that came from Minecraft 1.3, While I'm playing on my world let's say on Survival,temporary it disables me from getting blocks when I break, agresive mobs can even use "Charge" attack (Attack type used on most MMORPG games when the player/bot freezes on it's place for a second,runs into you as fast as it can and hits you withj more damage than it must,this kind of power can be found on games like Fate and probably WoW)
Let's get back in minecraft,This lag incrases the chance of me getting hit be a mob more than one time for less than a second,I can't hit the mob when there is a lag, NONE of the mobs can be hit.
I can't even open chests or use crafting tables or furnaces,there is nothing i can use or do when there's lag,the is lag.

AFTER THE LAG: FPS gets 1-7 woler,normally it's 20-30
Please fix this lag becausee it pisses me off so much and makes me stop playing Minecraft,I haven't played it about month, and I don't feel like playing it again.

Please fix this, it's getting UNFAIR.