Xodium
by deadsins
Xodium is a lightweight Fabric mod for Minecraft 1.21.11 that aims to reduce RAM use and cut garbage collection pauses in the client.
What it does
Xodium trades memory usage against stability, and its focus is on lowering the RAM a game session takes while limiting the pauses that garbage collection can cause. The mod is described as suited to both vanilla and modded setups, where it aims to smooth play in memory-heavy scenarios such as large worlds.
Its approach includes fewer temporary object allocations and pooled reuse of frequently used structures, along with more careful handling of chunk, entity and NBT data. Xodium is listed as working alongside Sodium and Lithium, and the author describes it as aimed at players running heavy modpacks.
Xodium is client-side only, so servers run without it and only the player's game needs it. Files are published for Fabric alone, for 1.21.11, under All rights reserved, so the code is not open source. The mod also expects a separate configuration menu mod to be installed for customizing its options.
Key features
Lower memory usage
Reduces object allocations and temporary memory use during play to keep the RAM footprint smaller.
Object pooling
Reuses frequently used structures instead of creating new ones, which cuts the work the garbage collector must do.
Fewer collection spikes
Minimizes garbage collection spikes so frame times stay steadier during heavy scenes.
Chunk and entity data handling
Optimizes how chunk, entity and NBT data are processed to limit memory churn while the world loads and runs.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Heavy modpacks
Players running large modpacks on the client can use Xodium to ease memory pressure in long sessions.
Large worlds
Memory-heavy scenarios such as large or busy worlds are the situations the mod is described as targeting.
Who it’s for: Players on Fabric 1.21.11 who run heavy modpacks or large worlds and want lower memory use alongside other performance mods like Sodium or Lithium.
How it compares
Fluorium is a Fabric client mod for 1.21.5 under the GNU General Public License v3.0 only, and it is open source. Pyre is client and server, open source under the Mozilla Public License 2.0, and covers 1.21 – 1.21.11. Memory Usage Display is also client-side only for Fabric 1.21.3 under the MIT License, but it shows memory figures rather than reducing them.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Xodium | Fabric | 1.21.11 | Client-side only | 2026-03-28 |
| Fluorium | Fabric | 1.21.5 | Client-side only | 2025-05-21 |
| Pyre | Fabric | 1.21 – 1.21.11 | Client and server | 2026-04-11 |
| Memory Usage Display | Fabric | 1.21.3 | Client-side only | 2024-12-27 |
Questions
Does Xodium need a configuration menu mod?
Does Xodium have to be installed on the server?
Which loader does Xodium support?
In the catalog
Xodium is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from deadsins
Similar mods
What the author says
Xodium is a lightweight mod focused on reducing RAM usage and minimizing garbage collection pauses in Minecraft. Designed for both vanilla and modded environments, it improves memory efficiency, stabilizes performance in large worlds, and smooths gameplay in memory-heavy scenarios. Reduces object allocations and…
Official listing
- Modrinth page
- modrinth.com/mod/xodium
- Owner
- deadsins
- Published
- 2026-03-28
- Updated on Modrinth
- 2026-03-28
- Facts verified
- 2026-10-15