FerriteCore

FerriteCore is a free, MIT-licensed coremod for Minecraft: Java Edition that targets RAM use. It reduces memory associated with block states, models, predicates, strings, voxel shapes, and baked quads through techniques such as compact neighbor storage, predicate caching, and deduplication. The project documents examples where individual optimizations save hundreds of megabytes; in one pack example, memory after garbage collection fell from roughly 3.1 GB to 1.1–1.2 GB on the title screen. It is listed for Minecraft versions 1.16.5 through 26.3, depending on loader builds, and supports Fabric, Forge, NeoForge, and Quilt. It is marked for both client-side and server-side use, and the maintainer recommends installing it in both places because some optimizations apply on the server. Several optimizations are documented as having no CPU impact during play, while some carry a load-time CPU cost. ThreadingDetector optimization is disabled by default because it may cause very rare race conditions. Builds for Minecraft 1.18 and newer are listed as incompatible with Hydrogen. The maintainer says versions earlier than 1.16 will not be supported.