Some savings due to, e.g., `area:iter`, and some unnecessary code removal / code simplifications
Some additional logging for getting more precise timings.
Not very spectacular, but also not invasive. The slow parts seem to be data transfer to/from the voxelmanip, lighting/water updates and the ore generation in nether, so not much in lua code.
Reviewed-on: https://git.minetest.land/VoxeLibre/VoxeLibre/pulls/4566
Reviewed-by: Mikita Wiśniewski <rudzik8@protonmail.com>
Co-authored-by: kno10 <erich.schubert@gmail.com>
Co-committed-by: kno10 <erich.schubert@gmail.com>
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