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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
Forge, NeoForge, Fabric
Licence
not stated
Downloads
1.1k
Updated
3 d ago
Available on
CurseForge
Space NodePartner

Host Hassium servers

One click and Hassium is installed with the right loader, on hardware built for it.

  • 1.21.11
  • Forge
  • NeoForge
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.11Forge, NeoForge, Fabric21+declared9 Dec 2025
1.21.10Fabric, NeoForge, Forge21+declared7 Oct 2025
1.21.9Fabric, NeoForge, Forge21+declared30 Sept 2025
1.21.8Fabric, Forge, NeoForge21+declared17 Jul 2025
1.21.7Forge, NeoForge, Fabric21+declared30 Jun 2025
1.21.6Forge, Fabric, NeoForge21+declared17 Jun 2025
1.21.5Fabric, NeoForge, Forge21+declared25 Mar 2025
1.21.4Forge, NeoForge, Fabric21+declared3 Dec 2024
1.21.3Forge, NeoForge, Fabric21+declared23 Oct 2024
1.21.2Fabric, NeoForge, Forge21+declared22 Oct 2024
1.21.1Forge, NeoForge, Fabric21+declared8 Aug 2024
1.20.6NeoForge, Fabric, Forge21+declared29 Apr 2024
1.20.5Fabric, Forge, NeoForge21+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
1.20.1Forge, NeoForge, 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 downloads9ff128378a7e…Get
  • Hassium 1.0.0 — 1.21.10 NeoForge25 Jul 20261.21.103.7 MB1 downloads2c60446cfcb4…Get
  • Hassium 1.0.0 — 1.21.10 Fabric25 Jul 20261.21.103.9 MB1 downloads55d7bfcccef6…Get
  • Hassium 1.0.0 — 1.21.9 NeoForge25 Jul 20261.21.93.7 MB1 downloads49bc37498918…Get
  • Hassium 1.0.0 — 1.21.9 Fabric25 Jul 20261.21.93.9 MB1 downloads87f8aed72d04…Get
  • Hassium 1.0.0 — 1.21.6 Fabric25 Jul 20261.21.63.9 MB1 downloads6d029df2be33…Get
  • Hassium 1.0.0 — 1.21.6 NeoForge25 Jul 20261.21.63.7 MB1 downloadsb654dd3187a4…Get
  • Hassium 1.0.0 — 1.21.8 Fabric25 Jul 20261.21.83.9 MB1 downloadsad8f2f9b4839…Get
  • Hassium 1.0.0 — 1.21.8 NeoForge25 Jul 20261.21.83.7 MB1 downloads723c42b4076c…Get
  • Hassium 1.0.0 — 1.21.7 Fabric25 Jul 20261.21.73.9 MB1 downloads104aef225a54…Get
  • Hassium 1.0.0 — 1.21.7 NeoForge25 Jul 20261.21.73.7 MB1 downloads85311857dc07…Get
  • Hassium 1.0.0 — 1.21.5 Fabric25 Jul 20261.21.53.9 MB1 downloadsac61668da507…Get
  • Hassium 1.0.0 — 1.21.5 NeoForge25 Jul 20261.21.53.7 MB1 downloadsf43c91dae5f5…Get
  • Hassium 1.0.0 — 1.21.4 Fabric25 Jul 20261.21.43.9 MB1 downloads389ed1ed45e5…Get
  • Hassium 1.0.0 — 1.21.4 NeoForge25 Jul 20261.21.43.7 MB1 downloads978e1876363e…Get
  • Hassium 1.0.0 — 1.21.1 NeoForge25 Jul 20261.21.13.7 MB1 downloads643f5c8dc3d1…Get
  • Hassium 1.0.0 — 1.21.1 Fabric25 Jul 20261.21.13.9 MB1 downloadse662e0e03c86…Get
  • Hassium 1.0.0 — 1.21.3 Fabric25 Jul 20261.21.33.9 MB1 downloadse37ddee0245e…Get
  • Hassium 1.0.0 — 1.21.3 NeoForge25 Jul 20261.21.33.7 MB1 downloads2a1093fb4864…Get
  • Hassium 1.0.0 — 1.21.2 Fabric25 Jul 20261.21.23.9 MB1 downloads24aadc828555…Get
  • Hassium 1.0.0 — 1.21.2 NeoForge25 Jul 20261.21.23.7 MB1 downloadse26d82a63c24…Get
  • Hassium 1.0.0 — 1.20.6 Fabric25 Jul 20261.20.63.9 MB1 downloadse79333a9a81b…Get
  • Hassium 1.0.0 — 1.20.6 NeoForge25 Jul 20261.20.63.7 MB1 downloads0aea5c191ef3…Get
  • Hassium 1.0.0 — 1.20.5 Fabric25 Jul 20261.20.53.9 MB1 downloads7844f175b720…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 loader does Hassium need?

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

Which Java version do I need for Hassium?

Java 21 or newer, because that is what the newest Minecraft release it supports requires. The requirement comes from the game rather than from the mod itself.

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?

From the author's own page on CurseForge, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Works on the same versions

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

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)

Last checked 1 d ago against CurseForge. 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? .