Chunkis is a high-performance, sparse storage engine for Minecraft. It slashes world save sizes by ~90% by only persisting player-made changes, using a custom binary format (CIS) designed for speed and efficiency.
CobbleStacker is a server-side Fabric mod that reduces lag by automatically merging nearby identical mobs, ground items, and spawners into a single entity with a stack counter, fully compatible with Cobblemon.