Suddenly with no system changes blocks started to reappear, this only happens on my favorite survival mode game/map other saves i have dont have the problem. My FPS is fine (over 400) everything is smooth excepts it takes forever for the blocks to go away, I have an 8 core 4ghz AMD with 16gb ram and GEForce 770 2Gb. I have uninstalled minecraft, uninstalled JAVA, tried 32bit 64 bit tried various versions of minecraft (1.8, 1.7.10 etc) installed optifine and set everything to get optimized speed nothing makes a difference. Please help!!!!!
it sounds like minecraft is starting to run out of memory for you :/