Just wanna say that this mod is a godsend! Thanks so much for the hard work! After trying to get rid of the fucking stutter I have had for months in minecraft this mod did it. Here are 3 comparisons of frametimes in the material energy 4 mod pack. (all taken with the same path capped at 80 fps)
Comparison of stock mod, just OptiFine, and just Fastcraft http://imgur.com/a/1uPjG