colored stones/blocks mod makes framerate go way down

[mineycraf]

Earlier I posted a bug that large bodies of ice lags the game, after doing some more testing its actually not ice, its when you have a somewhat larger structure of colored stones that lags the game. I did a test of a large vanilla stone structure VS white stone VS white cobblestone. For some reason, when looking at or being around a large while cobblestone/stone structure (and I am assuming all blocks from that mod) drops framerates pretty bad compared to vanilla blocks. The last picture is just where I was getting the lag that made me think it was the ice, but actually its the structure.

After using world edit to replace all colored stones with wool/vanilla blocks, framerate goes way up: