Offline Progression

Catch up your persistent claimed chunks after the server was offline, by replaying the real server tick loop, so any mod's blocks and entities progress correctly, not just a hardcoded list of vanilla mechanics.

What it does

When the server restarts after being offline, this mod fast-forwards time in a small set of player-claimed chunks: furnaces keep smelting, crops keep growing, fluids keep flowing, redstone keeps ticking, animals keep growing up, and any modded machine with a block entity (including Create) keeps working. It does this by actually re-running the game's own tick code, scoped to just those chunks, no per-mechanic simulation code, no guessing.

Commands

/chunkload add claims the chunk you are standing in as persistent (works in any dimension). /chunkload remove [x z] releases a claimed chunk. /chunkload list shows your claimed chunks and their center coordinates. /chunkload stats shows the duration and throughput of the last catch-up.

Gamerule

/gamerule offlineCatchupSpeed <n> multiplies how much time gets caught up (default 1).

Configuration

Editable in config/offlineprogression.json: maxCatchupDays (default 2, longest offline gap simulated) and maxCatchupWallClockSeconds (default 1200, real-time safety budget, the catch-up stops gracefully if it is exceeded).

Notes

2 persistent chunks per player by default. Overworld, Nether and End are all supported. Requires Fabric API.