If you’ve not already seen LookingGlass, you should probably check it out.

I still haven’t fixed the API distribution for LookingGlass. I’m trying, but I’ve a little too much going on right now to get to it.
However, I have made some fixes and things to it, so that’s progress.

Mystcraft’s baseline profiling has been rearranged. See the changelog for more details. In-game performance should improve.

Mystcraft is available from CurseForge.
LookingGlass is available from CurseForge.

Mystcraft Changelog
LookingGlass Changelogs

Enjoy!