From Minecraft 1.7.2 and above, I've experienced a massive frame rate drop in minecraft. In the 1.7 snapshots, I noticed that it decreased a lot but now it has got to the point where it is unplayable.

In 1.6, I usually play with 30fps. Render distance is short, GUI scale is normal, fancy graphics, all particles, etc. In 1.7 and 1.8, even the lowest render distance, small gui scale, no particles, no mipmapping, only gives me around 3fps.