
BB Preload World
A crude way to preload the Distant Horizons chunks, for single player and multiplayer
About this Mod
BB Preload World
Modern versions of Distant Horizons now have chunk loading over multiplayer, so if you are using a new version you may not need this mod
This mod can be used in single-player or multi-player to load chunks for the use of Distant Horizons
In multi-player, DH can only cache chunks the player has visited, this mod puts the player into spectator mode and files them around the map so the client can cache these chunks.
As an added bonus, client-side mini-map mods will also get loaded in when doing this.
How to use
The mod must be installed on the client and server.
If playing in single-player, it is recommended to set "Enable distant generation" to false in DH settings while running the routine.
You can also set the "CPU Load" in DH settings to one of the higher profiles (remember to set it back to a lower one after!).
To load the surrounding area, players can use the command /bb_preload_world_start
To cancel the process before it has completed on its own, use /bb_preload_world_stop
(Running the stop command before the routine finishes may lead to corrupt chunk caches)
At a radius of 30 chunks, it can take 30+ minutes to complete, at 60 chunks it could take multiple hours.
Settings
Settings are managed via game-rules.
/gamerule bb_preload_radius 30 sets the radius (in chunks) that will be loaded around the player.
/gamerule bb_preload_world_start_requires_opp true will make /bb_preload_world_start require OP to use.
/gamerule bb_preload_world_stop_requires_opp true will make /bb_preload_world_stop require OP to use.
How it works
When starting a preload routine, the server-side part of the mod keeps track of which chunk the player has got to.
The client sends packets to the server saying when a chunk has been cached at LOD levels 0 - 6, when the server has received this packet it will move the player on to the next chunk.
The client also tells the server if "Queued chunk updates" is too high, or when there are any "Update propagator tasks" in the queue or being processed. If either of these are true, the routine is paused to allow chunks to finish processing before continuing.
This is because in my testing if the client moves away from a chunk that has started processing but not finished, it can leave that chunk cache in a corrupt state.
Contact
For questions Discord is preferred, for issues GitLab is preferred.
Available Versions
How to Install BB Preload World on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).
Install Mod
Open the mod browser in the dashboard and search for "BB Preload World". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.1, 1.21
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
BB Preload World server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.
Is BB Preload World compatible with fabric?
BB Preload World officially supports fabric for Minecraft 1.21.1, 1.21. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with BB Preload World – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if BB Preload World consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Install BB Preload World with just one click on your server.