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SeamlessChunks

SeamlessChunks

Smoother chunk loading with network-aware send rates, multiplayer fair share, and in-game tuning.

308
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308
6

Compatibility

Minecraft: Java Edition

26.2
26.1.x
1.21.1–1.21.11

Platforms

Supported environments

Client and server

Tags

Creators

Details

Licensed MIT
Published last week

SeamlessChunks makes chunk loading feel smoother on Minecraft 1.21.1–1.21.11 and 26.1–26.2 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 ping on LAN gets a more aggressive send rate, while high ping or packet back-pressure slows things down to stay stable. Scheduling and priority work can run on a dedicated worker pool so multi-core CPUs help without fighting vanilla worldgen threads.

What it does

  • Faster chunk sending — higher configurable send rates, optional light-wait bypass, and extra chunk-cache passes
  • Network adaptation — scales send speed based on ping and unacknowledged batch pressure
  • Multiplayer fair share — reduces per-player send pressure when TPS drops or more players are online
  • Smart chunk priority — sends chunks in your view direction and predicted movement path first
  • Multithreaded scheduling — worker pool (Auto / Manual) for priority scoring and planning; auto-throttles when TPS drops. Does not replace vanilla worldgen threads or run Level/Entity work off-thread
  • In-game settings — click the SC button on the title screen (next to Singleplayer) or in the pause menu (next to Back to Game)
  • Compatibility mode — gentler behavior when other chunk mods are installed

Client & server

Works on both client and server. For dedicated servers, install on the server for the main improvements. Clients are optional but recommended for the settings UI and client-side optimizations. Singleplayer only needs the mod on your client.

Requirements

  • Minecraft 1.21.1 – 1.21.11, 26.1 – 26.2
  • Java 21+ (1.21.x) or 25+ (26.x)
  • Architectury API
  • Fabric API (Fabric only)

Configuration

Settings can be changed in-game via the SC button, or in config/seamlesschunks.properties.

Useful keys for the new worker pool: workerPoolEnabled, workerPoolMode (auto / manual), workerPoolThreads (Manual mode, 1–16).

Beta: test on a backup world before using on important saves. Some changes apply after rejoining a world.