Mojang PLEASE fix this! This makes it almost impossible to set up automatic farms! This is ridiculous!
Yup. Same here.
I am also having this problem. It seems to happen even faster in water. I am building an auto-chicken farm where the chickens are supposed to float on a level of water and drop their eggs below. If I hatch baby chickens into the water they seem to suffocate almost immediately. Adult chickens die quickly as well. I am about to test this while using a non-solid block at both the level the water is on and the one just above the water. I will report my findings after I am done.
I am having this same problem. I am on a mid-to-low end computer and it makes the game unplayable. If I change to peaceful, lag disappears. Please vote on this so it will shoot up the charts and maybe get fixed by 1.6.2 because, as is, MC is almost unplayable on anything other than peaceful. 😞