NotEnoughPalette

NotEnoughPalette, abbreviated NEP, changes how Minecraft's PalettedContainer holds block and biome values. Vanilla stores them in a bit-packed SimpleBitStorage, and NEP swaps that for direct-array access with bit packing based on cell index. Each chunk section picks a storage mode that fits its contents, and the mutation path is optimized so that edits to a section cost less work.

The mod works as a transparent drop-in replacement, so world data remains wire-compatible with vanilla and nothing needs to be added to or removed from a world. Factory creation, codec deserialization and network read and write were also reworked to copy and recreate containers in a lighter way. Memory use is reported as lower than vanilla for typical sections, and often well below it. It is an optimization mod, and it is open source under the MIT License.

Installation uses one hybrid JAR per loader: Fabric Loader 0.19.3 for Fabric, or NeoForge 26.2.0.1-beta for NeoForge. Either side can run it alone or both can, and neither needs it to connect, so byte-identical vanilla clients without NEP still join NEP servers and the reverse. The author describes it as compatible with performance mods such as Lithium and Sodium.