I’ve fixed all the world-hole bugs and optimised the render algorithms in a pre-release on GitHub, it’s not stable yet though. All algorithms are now faster by a factor of 8. Instead of doing 18*18*18*8*9 (419,904) lookups I’m now only doing 18*18*18*9 (52,488) lookups. It’s now faster than vanilla, and I’m planning on getting the lookups down to smaller than 20*20*20 (8000) to make it about 52x faster.
I’m also working on improving the lighting code and the liquid extension code.