Chunk loading slower in 1.8.2-pre1

Loading the world in 1.8.2-pre1 is much slower than in 1.8.1 & 1.8. The performance is comparable to 1.7.

Speed in 1.8.1 : https://www.youtube.com/watch?v=jyLavLlQ-P4
Speed in 1.8.2-pre1: https://www.youtube.com/watch?v=ARHat5DNcCM