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HassiumMinecraft mod for 1.21.11

Hassium is a high-performance Minecraft optimization mod providing efficient storage, network optimization, chunk caching, beyond-view rendering, and lighting optimization.

newest supported 1.21.11Server Utility
Latest version
Hassium 1.0.0 — 1.21.11 NeoForge
Minecraft
1.20.1 to 1.21.11
Java
Java 21+
Loaders
NeoForge, Fabric, Forge
Licence
not stated
Downloads
4.0k
Updated
9 d ago
Available on
CurseForge

Minecraft versions

Every version Hassium declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.11NeoForge, Fabric, Forge21+declared9 Dec 2025
1.21.10Fabric, NeoForge, Forge21+declared7 Oct 2025
1.21.9Fabric, NeoForge, Forge21+declared30 Sept 2025
1.21.8Fabric, NeoForge, Forge21+declared17 Jul 2025
1.21.7Fabric, NeoForge, Forge21+declared30 Jun 2025
1.21.6Fabric, NeoForge, Forge21+declared17 Jun 2025
1.21.5Fabric, NeoForge, Forge21+declared25 Mar 2025
1.21.4Fabric, NeoForge, Forge21+declared3 Dec 2024
1.21.3NeoForge, Fabric, Forge21+declared23 Oct 2024
1.21.2Fabric, NeoForge, Forge21+declared22 Oct 2024
1.21.1Fabric, NeoForge, Forge21+declared8 Aug 2024
1.20.6Fabric, NeoForge, Forge21+declared29 Apr 2024
1.20.5Fabric, NeoForge, Forge21+declared23 Apr 2024
1.20.4NeoForge, Fabric, Forge17+declared7 Dec 2023
1.20.3Fabric, Forge, NeoForge17+declared4 Dec 2023
1.20.2Forge, Fabric, NeoForge17+declared20 Sept 2023
1.20.1NeoForge, Forge, Fabric17+declared12 Jun 2023

Download

From Hassium’s own host. Nothing is re-hosted here.

All 34 releases
Hassium 1.0.0 — 1.21.11 NeoForgerelease25 Jul 2026

hassium-neoforge-1.0.0-1.21.11.jar · 3.7 MB · for 1.21.11

Download latest
d146dae5c4d2…
Older versions24
  • Hassium 1.0.0 — 1.21.11 Fabric25 Jul 20261.21.113.9 MB1 download9ff128378a7e…Get
  • Hassium 1.0.0 — 1.21.10 NeoForge25 Jul 20261.21.103.7 MB1 download2c60446cfcb4…Get
  • Hassium 1.0.0 — 1.21.10 Fabric25 Jul 20261.21.103.9 MB1 download55d7bfcccef6…Get
  • Hassium 1.0.0 — 1.21.9 NeoForge25 Jul 20261.21.93.7 MB1 download49bc37498918…Get
  • Hassium 1.0.0 — 1.21.9 Fabric25 Jul 20261.21.93.9 MB1 download87f8aed72d04…Get
  • Hassium 1.0.0 — 1.21.6 Fabric25 Jul 20261.21.63.9 MB1 download6d029df2be33…Get
  • Hassium 1.0.0 — 1.21.6 NeoForge25 Jul 20261.21.63.7 MB1 downloadb654dd3187a4…Get
  • Hassium 1.0.0 — 1.21.8 Fabric25 Jul 20261.21.83.9 MB1 downloadad8f2f9b4839…Get
  • Hassium 1.0.0 — 1.21.8 NeoForge25 Jul 20261.21.83.7 MB1 download723c42b4076c…Get
  • Hassium 1.0.0 — 1.21.7 Fabric25 Jul 20261.21.73.9 MB1 download104aef225a54…Get
  • Hassium 1.0.0 — 1.21.7 NeoForge25 Jul 20261.21.73.7 MB1 download85311857dc07…Get
  • Hassium 1.0.0 — 1.21.5 Fabric25 Jul 20261.21.53.9 MB1 downloadac61668da507…Get
  • Hassium 1.0.0 — 1.21.5 NeoForge25 Jul 20261.21.53.7 MB1 downloadf43c91dae5f5…Get
  • Hassium 1.0.0 — 1.21.4 Fabric25 Jul 20261.21.43.9 MB1 download389ed1ed45e5…Get
  • Hassium 1.0.0 — 1.21.4 NeoForge25 Jul 20261.21.43.7 MB1 download978e1876363e…Get
  • Hassium 1.0.0 — 1.21.1 NeoForge25 Jul 20261.21.13.7 MB1 download643f5c8dc3d1…Get
  • Hassium 1.0.0 — 1.21.1 Fabric25 Jul 20261.21.13.9 MB1 downloade662e0e03c86…Get
  • Hassium 1.0.0 — 1.21.3 Fabric25 Jul 20261.21.33.9 MB1 downloade37ddee0245e…Get
  • Hassium 1.0.0 — 1.21.3 NeoForge25 Jul 20261.21.33.7 MB1 download2a1093fb4864…Get
  • Hassium 1.0.0 — 1.21.2 Fabric25 Jul 20261.21.23.9 MB1 download24aadc828555…Get
  • Hassium 1.0.0 — 1.21.2 NeoForge25 Jul 20261.21.23.7 MB1 downloade26d82a63c24…Get
  • Hassium 1.0.0 — 1.20.6 NeoForge25 Jul 20261.20.63.7 MB1 download0aea5c191ef3…Get
  • Hassium 1.0.0 — 1.20.6 Fabric25 Jul 20261.20.63.9 MB1 downloade79333a9a81b…Get
  • Hassium 1.0.0 — 1.20.5 Fabric25 Jul 20261.20.53.9 MB1 download7844f175b720…Get

Frequently asked

Does Hassium work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version Hassium declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Hassium support?

Everything the author has declared, from 1.20.1 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does Hassium support?

NeoForge, Fabric, Forge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Hassium?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

How do I install Hassium?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Hassium safely?

Start with the author's page on CurseForge, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from CurseForge, where the author last updated it on 29 Sept 2026. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .