Framerate decrease in 14w30c vs 1.7.10

Framerates and overall smoothness of gameplay has decreased in 14w30c when compared to 1.7.10. In 1.7.10, I get ~35 FPS in my world while 14w30c is closer to ~18 FPS in the same spot, causing a very noticeable degradation is smoothness. I've been able to increase FPS a bit by turning off clouds, reducing smooth lighting, and switching to fast graphics, but not enough to get the game as smooth as in 1.7.10. Render distance is set to 16.