Minecraft Forums

OK minecraft was running fine a couple of days ago, then it just slowed down and was impossible to play. It started to have severe block lag, and redstone lag, fps lag, and sometimes I will spawn invisible chunk, and some times I'll be surrounded by invisible chunks. Then I got a notice telling me that I ran out of memory so I gave it 3gs of RAM out of my 4, but it would still be running at 98% allocated memory. Then I tried playing another world and had none of these problems. I am running on the newest version of the macbook pro notebook (non retina display with 4 gigs of RAM). Any help would be appreciated