Hassium
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Hassium is a high-performance Minecraft optimization mod providing efficient storage, network optimization, chunk caching, beyond-view rendering, and lighting optimization.
Forge is a popular mod loader for versions 1.1+ of Minecraft.
Neoforge is a fork of the Minecraft Forge available for versions 1.20.1+ of Minecraft. Many Forge mods are compatible with Neoforge and vice versa.
Fabric is a mod loader for versions 1.14+ of Minecraft, particularly popular for client side and optimization mods.
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Description
Hassium is a high-performance Minecraft optimization mod providing efficient storage, network optimization, chunk caching, beyond-view rendering, and lighting optimization. Covers Minecraft 1.20.1–1.21.11 on Fabric / Forge / NeoForge.
Hassium 是 Minecraft 的高性能优化模组，提供高效存储、网络优化、区块缓存、超视渲染与光照优化。覆盖 Minecraft 1.20.1–1.21.11，支持 Fabric / Forge / NeoForge。
GitHub Repository · Wiki 中文 · Wiki English
English
Quick start
- Download the JAR matching your Minecraft version and loader from the Files tab.
- Put it in
mods/on the client and/or server. Fabric additionally requires Fabric API; Forge and NeoForge need no extra dependency. - Install on both client and server for negotiated compression and cache hits. Vanilla clients can still join by default.
- Back up existing worlds before first enabling storage. Storage compression rewrites on-disk chunk payloads.
Full instructions: Installation · FAQ
Features
| Feature | Description |
|---|---|
| Efficient storage | Higher-ratio world chunk compression for smaller saves; keeps vanilla Region (.mca) layout |
| Network compression | More efficient compression for chunks and packets — less bandwidth and wait time |
| Chunk cache | Loaded chunks are kept locally; revisiting an area prefers the cache instead of full downloads |
| Section delta | On cache mismatch, fetch only changed sections (sectionDelta) instead of the whole chunk |
| Beyond-view render | When client RD exceeds server view distance (multiplayer), fill the outer ring from local cache (render-only; no out-of-range server requests) |
| World export | /hassiumc export writes the local cache as a vanilla Anvil singleplayer world |
| Light stripping | Server can omit light data; the client recomputes lighting locally to save more bandwidth |
| Light cache | Light data is cached after first recompute; cache hits apply pre-computed lighting directly, skipping expensive recomputation |
| Control failover | If the TCP control connection stalls or drops, reconnect automatically through candidate endpoints; the cache stays warm and the disconnect screen is hidden (data-plane failover) |
| Weighted distribution | Multiple UDP/KCP endpoints carry the data plane with weight-based round-robin; the control plane stays on vanilla TCP |
| Smooth loading | Caps main-thread work during join and view expansion to reduce hitch spikes |
| Client-friendly | Clients without the mod can connect by default; install on both sides for full compression and cache benefits |
| Traffic metrics | /hassium stats (server) and /hassiumc stats (client) to inspect compression and cache results |
Supported versions
| Minecraft | Fabric | Forge | NeoForge |
|---|---|---|---|
| 1.20.1 | Yes | Yes | Yes |
| 1.20.2–1.20.5 | Yes | — | Yes |
| 1.20.6 | Yes | Yes | Yes |
| 1.21.1 | Yes | Yes | Yes |
| 1.21.2 | Yes | — | Yes |
| 1.21.3–1.21.10 | Yes | Yes | Yes |
| 1.21.11 | Yes | — | Yes |
Complete matrix: Support Matrix
Documentation
| Need | Wiki page |
|---|---|
| Setup and dependencies | Installation |
| Every configuration option | Configuration |
| Server and client commands | Commands |
| Cache, section delta, light optimization and more | Features |
| Beyond-view render and world export | Beyond-view render · World export |
| Compatibility and diagnostics | Compatibility · Troubleshooting |
| UDP data plane and control failover | Data Plane and Failover |
简体中文
快速开始
- 在 Files 页下载与你的Minecraft 版本和加载器匹配的 JAR。
- 放入客户端或服务端的
mods/。Fabric 另需 Fabric API；Forge / NeoForge 无额外前置。 - 推荐服务端与客户端都安装，以启用协商压缩和缓存命中；未装 Hassium 的客户端默认仍可连接。
- 已有世界首次启用存储前务必备份。 存储压缩会改写区块落盘 payload。
功能
| 能力 | 说明 |
|---|---|
| 高效存储 | 世界区块用更高压缩率落盘，显著减小存档体积；仍兼容原版 Region（.mca）布局 |
| 网络压缩 | 区块与数据包用更高效压缩传输，降低带宽占用与下载等待 |
| 区块缓存 | 曾加载过的区块写入本地；再次进入同一区域时优先用本地数据，少传全量包 |
| 分段增量 | 缓存过期时仅拉取变更分段（sectionDelta），避免整块重传 |
| 超视渲染 | 多人服客户端 RD 大于服务端视距时，用本地缓存回填视距外地形（仅渲染、不向服索要视距外区块） |
| 世界导出 | /hassiumc export 将本地缓存导出为可进单机的原版 Anvil 世界 |
| 光照剥离 | 服务端可不传光照数据，由客户端本地重算，进一步省流量 |
| 光照缓存 | 首次加载重算后缓存光照数据，后续缓存命中直接应用，跳过同步重算 |
| 主控热切 | TCP 主控断或卡时按候选自动重连，缓存暖续、隐藏断连界面（数据面 failover） |
| 加权分流 | 多 UDP/KCP endpoint 按 weight 加权轮询承载数据面，控制面留原版 TCP |
| 平滑加载 | 进服与视野扩展时限制主线程压力，减少卡顿尖峰 |
| 兼容友好 | 未安装本模组的客户端默认可连接；双端都装才能吃满压缩与缓存 |
| 流量监控 | /hassium stats（服务端）、/hassiumc stats（客户端）查看压缩与缓存效果 |
支持版本
| Minecraft | Fabric | Forge | NeoForge |
|---|---|---|---|
| 1.20.1 | ✅ | ✅ | ✅ |
| 1.20.2–1.20.5 | ✅ | — | ✅ |
| 1.20.6 | ✅ | ✅ | ✅ |
| 1.21.1 | ✅ | ✅ | ✅ |
| 1.21.2 | ✅ | — | ✅ |
| 1.21.3–1.21.10 | ✅ | ✅ | ✅ |
| 1.21.11 | ✅ | — | ✅ |
完整矩阵见：支持矩阵
文档导航
| 需要了解的内容 | Wiki 页面 |
|---|---|
| 安装和前置依赖 | 安装 |
| 全部配置项 | 配置 |
| 服务端和客户端命令 | 命令 |
| 缓存、分段增量、光照优化等 | 特性 |
| 超视渲染与缓存世界导出 | 超视渲染 · 世界导出 |
| 兼容性与故障排查 | 兼容性 · 排查 |
| UDP 数据面与主控 Failover | 数据面与主控 Failover |
许可证：GPL-3.0-or-later
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