Flerovium
by MoePus
Flerovium is a client-side rendering optimization for Forge and NeoForge that speeds up how items, particles and entities are drawn, aimed at raising frame rates.
What it does
The mod targets the rendering stage of the game. It is built to make drawing faster while keeping the visual result close to what the game produces without it, so its changes stay focused on how work is done rather than on what appears on screen. Flerovium needs no server component: only the client runs it, and a server with or without it works the same for every player.
The author describes gains of more than 50 percent for item rendering, about 50 percent for particle rendering and about 30 percent for entity rendering. These figures come from the author and have not been measured here. Each build depends on a rendering base mod listed with its file, so that dependency must be installed next to it. Files are published for 1.20.1 and 1.21.1, with the latest Forge file at 1.2.19 and the latest NeoForge file at 1.2.0 in the alpha channel. The code is released under the GNU Lesser General Public License v3.0 only, so it is open source.
Key features
Backface culling
Faces of models that point away from the camera are skipped during drawing, so less geometry reaches the GPU.
Fast math
Routine calculations used while preparing draw calls are replaced with quicker equivalents.
Fast culling
Objects outside the view are rejected earlier in the pipeline, before their full rendering work begins.
Cache light
Lighting values are stored and reused between frames instead of being recalculated for each object.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Busy scenes with many entities
Players in large villages, mob farms or crowded builds can use the mod where entity and item drawing take the most time.
Particle-heavy play
Areas with many particle effects, such as explosions or fountains, benefit from the particle rendering changes.
Who it’s for: Players on Forge or NeoForge who already run a rendering base mod, and who want a higher frame rate in 1.20.1 or 1.21.1 without changing the server.
How it compares
Clear Gpu Cache is a client-side only mod for Forge and NeoForge across 1.19.2 – 1.21.11, released under the MIT License and open source, so it targets GPU cache handling instead of drawing work. Cull Particles MultiLoader is client-side only, open source under the CC0 1.0 Universal license and available for Fabric, Forge, NeoForge and Quilt across 1.21 – 1.21.5, so it covers particle culling on more loaders. Brute Force Culling Revamped is client-side only for Fabric and NeoForge on 1.21.1, released under the GNU Lesser General Public License v3.0 or later, so it does not run on Forge.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Flerovium | Forge and NeoForge | 1.20.1 – 1.21.1 | Client-side only | 2026-09-26 |
| Clear Gpu Cache | Forge and NeoForge | 1.19.2 – 1.21.11 | Client-side only | 2025-04-18 |
| Cull Particles MultiLoader | Fabric, Forge, NeoForge and Quilt | 1.21 – 1.21.5 | Client-side only | 2025-01-30 |
| Brute Force Culling Revamped | Fabric and NeoForge | 1.21.1 | Client-side only | 2026-08-18 |
Questions
Does Flerovium need to be installed on the server?
Which dependency does Flerovium require on Forge?
Which game versions does Flerovium support?
Which NeoForge file is the newest?
In the catalog
Flerovium is one of 3,545 Optimization mods on ModsFinder, and one of 1,441 Optimization mods for Forge. 32,366 mods support Minecraft 1.21.1.
More from MoePus
Similar mods
Official listing
- Modrinth page
- modrinth.com/mod/flerovium
- Owner
- MoePus
- Published
- 2025-03-10
- Updated on Modrinth
- 2026-09-26
- Facts verified
- 2026-10-15