Board Thread:Bug Reports/@comment-86.152.155.88-20150106151016/@comment-25560665-20150106152514

You will have to be more specific.

a) Fastcraft doesn't install

b) Fastcraft doesn't reduce lag

If a) than your doing/done something wrong (trust me thing always is the case)

If b) than there is not much anyone can do, since this game actually needs this amount of checking that your computer doesn't handle very well. This is made worse by the fact that mod is set in another dimension. Minecraft treates Overworld and all other dimensions differently for some reason.