I rewrote the minetestmapper.py tool to C++. It is at least 50 times faster than original. ./minetest_mapper ... 6,96s user 0,16s system 99% cpu 7,181 total python minetestmapper.py ... 531,58s user 1,66s system 99% cpu 8:55,13 total Source code is on github ( https://github.com/mireq/minetest-mapp...