q3map2's meta stage is not parallelized
q3map2
's meta stage is not parallelized and is very slow.
It looks like the bloodmap fork has parallelized it, badly the relevant changes are mixed within a multipurpose commit, preventing cherry-picking:
https://github.com/paulvortex/BloodMap/commit/81ce7dfaf21c4c99347c6689761f0d041190b5dd