SeamlessChunks
by Rhintypler
SeamlessChunks changes how the server sends chunks to players, adjusting send rates to network conditions and player count on Fabric and NeoForge.
What it does
The mod replaces the vanilla chunk send limits with a pipeline that scales its send rate from each player's ping and unacknowledged batch pressure. Chunks in the direction a player is looking, or along a predicted movement path, are sent first. Chunk work runs on a configurable worker pool, which can be set to auto or manual with 1 to 16 threads, and the pool's priority scoring can be tuned in game.
The mod is installed on the server and on each client, since the environment is client and server. Multiplayer servers can share the send budget fairly across players and throttle when TPS drops. A compatibility mode eases its behavior when other chunk mods are installed, and Architectury API, Fabric API and YetAnotherConfigLib (YACL) are required dependencies. It is published for 1.21.1 – 26.3 under the MIT License and is not open source.
Key features
Network-aware send rates
Send speed rises on low-ping connections and backs off when packet back-pressure builds up, so the link stays stable.
Fair share for multiplayer
Per-player send pressure is reduced as more players join, which limits TPS drops on busy servers.
Predictive chunk priority
Chunks in view and along the predicted movement path are queued before the rest of the area.
Multithreaded worker pool
Level and entity work runs off-thread on a worker pool, with auto or manual thread counts for multi-core CPUs.
Faster world loading
Initial world generation runs faster than vanilla, so the Loading Terrain screen is shown for less time before a player spawns.
Gallery
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x11 of 11 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 3
How it compares
Lon is a client or server mod for Fabric and NeoForge, released under All rights reserved and not open source, with files for 26.1.2 – 26.2. Moonrise is also for Fabric and NeoForge, optional on either side, open source under the GNU General Public License v3.0 only, and covers 1.21 – 26.3. Both are alternatives that differ in environment or license.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| SeamlessChunks | Fabric and NeoForge | 1.21.1 – 26.3 | Client and server | 2026-09-23 |
| Lon | Fabric and NeoForge | 26.1.2 – 26.2 | Client or server, optional | 2026-10-11 |
| Moonrise | Fabric and NeoForge | 1.21 – 26.3 | Client or server, optional | 2026-09-27 |
Questions
Does SeamlessChunks need Fabric API on NeoForge?
Does the server need SeamlessChunks installed?
How is the worker pool configured?
In the catalog
SeamlessChunks is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 8,071 mods support Minecraft 26.3.
Similar mods
What the author says
SeamlessChunks makes chunk loading feel smoother on Minecraft 1.21.1–1.21.11 and 26.1–26.3 for Fabric and NeoForge. Instead of sticking to vanilla send limits, this mod speeds up the server chunk pipeline, boosts how fast the client can receive and render chunks, and automatically adjusts when conditions change — low…
Official listing
- Modrinth page
- modrinth.com/mod/schunks
- Owner
- Rhintypler
- Published
- 2026-07-03
- Updated on Modrinth
- 2026-09-23
- Facts verified
- 2026-10-15