Phantasium
by 1vaniam
Phantasium is a Fabric client mod that reduces the rendering cost of plugin-driven content on servers running ModelEngine, ItemsAdder, Nexo or Oraxen.
What it does
Phantasium targets this plugin-specific layer, which general-purpose optimization mods do not address. When a player joins a server, the mod detects which of these plugins are active and applies the matching optimizations without manual setup.
Phantasium runs alongside general optimization mods such as Sodium, EntityCulling and ImmediatelyFast, covering the areas they leave untouched. The mod works entirely on the client and requires no server-side installation. It depends on Cloth Config API and Mod Menu. The current file is 1.1.0 for 1.21.11, published on the beta channel, and the project is released under All rights reserved, so it is not open source. Public source code and an issue tracker are available.
Key features
Plugin detection on join
On joining a server, the mod checks which supported plugins are running and enables only the optimizations that apply.
Display entity optimization
Reduces the client cost of the large numbers of display entities and armor stands that the supported plugins create.
Custom packet handling
Targets the custom packets these plugins send, which general-purpose mods do not handle.
Dense furniture and mob areas
Focuses on towns, hubs and combat zones where many custom mobs and furniture pieces render together.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 2
How it compares
ModelEngine Client Optimization is a client-side mod for Fabric and NeoForge, released under a custom license and not open source, with files for 1.19.4 – 26.2. FPSFlow is a client-side Fabric mod for 1.21.11 – 26.2 under the GNU Affero General Public License v3.0 only, and it is open source. Phantasium covers only Fabric, for 1.21.11, and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Phantasium | Fabric | 1.21.11 | Client-side only | 2026-06-13 |
| ModelEngine Client Optimization | Fabric and NeoForge | 1.19.4 – 26.2 | Client-side only | 2026-06-22 |
| FPSFlow | Fabric | 1.21.11 – 26.2 | Client-side only | 2026-07-29 |
Questions
Does Phantasium need Cloth Config API and Mod Menu?
Does a server need Phantasium installed?
Which game version does Phantasium support?
In the catalog
Phantasium 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.
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What the author says
Phantasium is a client-side optimization mod for Minecraft designed specifically for servers running ModelEngine, Nexo, ItemsAdder, and Oraxen. four popular plugins that spawn large numbers of display entities, armor stands, and custom packets that general-purpose optimization mods have no awareness of. The mod works…
Official listing
- Modrinth page
- modrinth.com/mod/phantasium
- Owner
- 1vaniam
- Published
- 2026-05-27
- Updated on Modrinth
- 2026-06-13
- Facts verified
- 2026-10-15