DefineOutside

  So you start off with a 755.2 MiB world (in this test, it is a section of an existing DEFLATE-compressed world that has been lived in for a while). If you recreate its regions it will compact it down to 695.1 MiB

  You set region-file-compression=lz4 and run --recreateRegionFiles and it turns into a 998.9 MiB world. Makes sense, worse compression ratios but less CPU is what mojang documented in the changelog. Neat, but I'm confused as to what the benefits are as I/O increasingly becomes the more constrained thing nowadays. This is just a brief detour from what I'm really trying to test

  You set region-file-compression=none and it turns into a 3583.0 MiB world. The largest region file in this sample was 57 MiB

  Now, you take this world, and compress each of the region files individually using zstd -9, so that the region files are now .mca.zst files. And you get a world that is 390.2 MiB