Material Rule Compiler

Vanilla material rules are evaluated at runtime while chunks generate. The mod compiles them into class files using the ASM library, with static functions and an optimized layout, so the same rule set runs with fewer allocations. Random splitters and biome predictions used by material rules also allocate less, and the author reports a 30 to 40 percent decrease in surface builder execution times. The mod is experimental and changes how world generation runs, with the author noting that vanilla non-determinism is kept in mind.

Vanilla parity is maintained, including with datapacks. Where the mod encounters modded content it does not understand, it falls back to normal execution. Compatibility with other worldgen mods is tested against Terratonic and similar projects, though incompatibilities remain possible. Installation requires ZConfig, and Fast Noise is an optional addition. Moonrise is listed as incompatible. The mod runs on the server only, and the Fabric and Quilt builds cover 26.1 – 26.3 with 5 release versions and snapshot builds.