OptiPrime Build for Minecraft 1.21.1, 1.12.2
A pre-configured, open-source client modpack that replaces OptiFine. It increases framerates (FPS) and lowers RAM allocation through a tested combination of performance mods.
Fabric
NeoForge
ForgeAbout the OptiPrime modpack
OptiPrime is a pre-configured client modpack built to reduce RAM consumption and increase framerates (FPS). It functions as an open-source alternative to OptiFine.
Functional Features
- Pre-assembled: A ready-to-use mod list. Requires no manual searching or testing of individual mods.
- Resource Management: Lowers memory allocation and stabilizes frametimes across different hardware setups.
- Open-Source Base: Compiled entirely from open-source projects, ensuring technical transparency and rapid updates.
- Multi-Loader Support: Actively maintained for NeoForge, Fabric, Forge, and Quilt.
Technical Foundation
Performance is achieved through a specific set of mods (exact list varies by loader and game version):
- Rendering: Sodium / Embeddium alters chunk rendering logic to increase FPS.
- Memory: FerriteCore and ModernFix reduce RAM usage and patch vanilla memory leaks.
- Culling: EntityCulling and MoreCulling skip the rendering of unseen entities and blocks to save CPU cycles.
- Shaders: Iris / Oculus provide native compatibility for shader packs.
Version Support
We maintain the modpack across the following game versions:
Minecraft Version - Supported Loaders - Status
26.2 - NeoForge, Fabric - 🟢 Active (Frequent updates) 26.1.2 - NeoForge, Fabric - 🟢 Active 1.21.4 - NeoForge, Fabric - 🟡 Stable / LTS 1.21.1 - NeoForge, Fabric - 🟡 Stable / LTS 1.20.1 - NeoForge, Fabric, Forge, Quilt - 🟡 Stable / LTS 1.19.4 - Fabric - 🟡 Stable / LTS 1.16.5 & 1.12.2 - Forge, Fabric - 🟡 Stable / LTS 1.19.2 & Below - Fabric, Quilt - 🔴 Not supported
Feedback & Bug Reports
Bug reports, technical suggestions, and direct communication with the developer are handled via our Discord server.
How to install OptiPrime
With Millida Launcher
Install Millida Launcher
The launcher is free: download it at millida.net/launcher and sign in with any nickname.
Click “Install” on this page
The launcher opens and installs the modpack for Minecraft 1.12.2–26.2 on Fabric, Forge or NeoForge automatically.
Launch the game
A profile with it appears in the launcher: click “Play”.
Manually
Download the modpack archive
In the version list above, pick the file OptiPrime-FB03-26.2 [Fabric] [26.2] OptiPrime-FB03-26.2_Fabric.mrpack (1.8 MB).
Import it into a launcher
A launcher that supports modpacks (Millida Launcher, Prism) takes the archive via “Add modpack”, then “From file”. No need to unpack it yourself.
Allocate memory
Modpacks need more memory than the plain game: set 4–6 GB in the profile settings.
Versions
With dependencies
| Minecraft | Loader | File | Date | Actions |
|---|---|---|---|---|
| 26.2 | NeoForge | 26.232.6 KB 1 | ||
| 26.2 | Fabric | 26.21.8 MB | ||
| 26.1.2 | NeoForge | 26.1.227.5 KB | ||
| 26.1.2 | Fabric | 26.1.223 KB | ||
| 1.21.4 | NeoForge | 1.21.422.2 KB | ||
| 1.21.4 | Fabric | 1.21.422.4 KB | ||
| 1.21.1 | NeoForge | 1.21.11.3 MB | ||
| 1.21.1 | Fabric | 1.21.1866 KB |
What it needs to run
- YetAnotherConfigLib (YACL)already included
- Ksyxisalready included
- Dependencyalready included
- Dependencyalready included
- Dependencyalready included
- ServerCorealready included
- More Cullingalready included
- Dependencyalready included
- ImmediatelyFastalready included
- Gnetumalready included
- Dependencyalready included
- Dependencyalready included
- Cloth Config APIalready included
- Sodiumalready included
- AI Improvementsalready included
- Dependencyalready included
- Dependencyalready included
- MixinBooteralready included
- Dependencyalready included
- Almanacalready included
- Dependencyalready included
- Fabric Language Kotlinalready included
- Dependencyalready included
- Dependencyalready included
- Dependencyalready included
- Resourceful Configalready included
- Entity Cullingalready included
- Memory Leak Fixalready included
- Dependencyalready included
- Fabric APIalready included
- ScalableLuxalready included
- Sodium Extraalready included
- Model Gap Fixalready included
- Dependencyalready included
- Dependencyalready included
- ModernFix-mVUSalready included
- Dependencyalready included
- Clumpsalready included
- Iris Shadersalready included
- Dependencyalready included
- Structure Layout Optimizeralready included
- Dependencyalready included
- AsyncParticlesalready included
- Packet Fixeralready included
- MidnightLibalready included
- Dependencyalready included
- Dependencyalready included
- Dependencyalready included
- Text Placeholder APIalready included
- BadOptimizationsalready included
- Lithiumalready included
- Fzzy Configalready included
- Dependencyalready included
- ModernFixalready included
- Dependencyalready included
- Clumpsalready included
- Dependencyalready included
- Embeddiumalready included
- Dependencyalready included
- Moonlight Libalready included
- Language Reloadalready included
- FerriteCorealready included
- Dependencyalready included
- ThreadTweakalready included
- FastQuitalready included
- Dependencyalready included
- (Sodium) Chloridealready included
- Dependencyalready included
- Async Loggeralready included
FAQ
Which Minecraft versions does OptiPrime work on?
There are files for 1.12.2–26.2, 7 versions in total. The newest is 26.2.
Is OptiPrime for Forge or Fabric?
There are files for Fabric: 1.21–26.2, for Forge: 1.12.2–1.16.5 and for NeoForge: 1.21.1–26.2.
Which mods are in the OptiPrime modpack?
Mods in the modpack include YetAnotherConfigLib (YACL), Ksyxis, Dependency, ServerCore, More Culling, ImmediatelyFast, Gnetum, Cloth Config API and 32 more.
How do I download OptiPrime?
With Millida Launcher: it installs OptiPrime into a modpack by itself, for the right game version and loader. The launcher is free.
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