EfficientHashing

EfficientHashing changes how Vec3i and its subclass BlockPos compute their hash codes. The replacement algorithm, called PhiMix, gives nearly every distinct position its own code, where the vanilla algorithm assigns many positions the same value. The mod's author describes the change as affecting wherever the hash code is used, so any feature that stores positions in hash-based collections is touched by it.

In a test covering every block position from -100, -20, -100 to 100, 50, 100, about 2,800,000 objects, the vanilla algorithm produced 194,571 distinct hash codes, while PhiMix produced 2,868,471. The author reports PhiMix running at about 95.3 percent of the vanilla speed, a gap described as small next to other hashing solutions. The default position 0, 0, 0 still hashes to 0 under PhiMix, which keeps behavior compatible with vanilla.

Every player and the server need a copy of the mod. It is published for Fabric, Forge and NeoForge, with files for game versions 1.18 – 26.1.2 across 13 release versions. The mod is licensed under the GNU Lesser General Public License v3.0 only, and it is open source, with the source code publicly available.