Optis
by Mouldytoast
Optis is a Fabric client-side optimizer that manages how Minecraft's textures occupy GPU memory, aiming to reduce VRAM pressure and stutter.
What it does
Optis monitors which textures the player is drawing and adjusts their residency in GPU memory. Textures that are no longer needed are safely demoted and unloaded, while frequently used textures stay ready for rendering. Instead of keeping every texture resident, the GPU memory budget is spent on what the player is currently drawing.
The mod targets large worlds, modpacks and texture-heavy setups, where high-resolution resource packs can fill GPU memory quickly and make texture uploads cause lag spikes. It is built to run beside common performance mods, and it creates a configuration file that controls how aggressively textures are demoted.
Optis runs on the client alone and needs Fabric API as its required dependency. Servers do not need it installed. The MIT License covers the code, but the mod is not open source. Files are published for Fabric only, for 1.21.11, 26.2 and 26.3, with 1.0.0 for 26.3 as the latest file.
Key features
Texture residency tracking
Textures are tracked by how often they are used, and their residency in GPU memory is adjusted to match.
Smoother texture loading
Sudden texture upload spikes are reduced, which smooths gameplay while exploring and loading new assets.
Configurable demotion
A configuration file lets players set how aggressively unused textures are demoted from GPU memory.
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 1
How it compares
Gpu Cpu Util is client-side and open source under the MIT License, with Fabric files for 1.21 – 1.21.11, so it covers the same release line as Optis with a wider range. VRAM Killer is also client-side only and published for 26.1 – 26.1.2, a version range that overlaps only the start of Optis's builds. Xodium is client-side only and targets 1.21.11, the same version as one of Optis's files, but it is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Optis | Fabric | 1.21.11 – 26.3 | Client-side only | 2026-09-20 |
| Gpu Cpu Util | Fabric | 1.21 – 1.21.11 | Client-side only | 2026-01-09 |
| VRAM Killer | Fabric | 26.1 – 26.1.2 | Client-side only | 2026-09-12 |
| Xodium | Fabric | 1.21.11 | Client-side only | 2026-03-28 |
Questions
Does Optis need Fabric API?
Does a server need Optis installed?
Which game versions does Optis support?
In the catalog
Optis is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 8,071 mods support Minecraft 26.3.
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What the author says
Optis is a client-side performance mod that intelligently manages Minecraft’s texture memory to reduce VRAM usage and prevent stutters. Instead of keeping every texture loaded in GPU memory, Optis tracks which textures are actively used and dynamically adjusts their residency. Unused textures can be safely demoted or…
Official listing
- Modrinth page
- modrinth.com/mod/optis
- Owner
- Mouldytoast
- Published
- 2026-03-09
- Updated on Modrinth
- 2026-09-20
- Facts verified
- 2026-10-15