Hi, In one of my custom map worlds I am getting a huge amount of block lag. My client does not lag as I get about 150 fps. I am running 14w27b and the redstone is in the spawnchunks, Here is a gif showing the lag. Sorry the gif is choppy. My avi to gif converter isnt very good
http://www.gfycat.com/PoliteEssentialFlickertailsquirrel
Thanks in advance
Read more: Single Player Block Lag - Minecraft?