Java 21+ Performance Guide
Minecraft 1.12.2, a beloved version of the game, ran on MCO, traditionally runs on Java 8. However, with advancements in Java technology, upgrading to Java 21+ via Cleanroom can significantly enhance performance, reduce latency, and improve overall gameplay experience.
Why Upgrade to Java 21+?
- Performance Improvements: Java 21+ offers numerous performance enhancements, including better garbage collection and optimized memory management.
- Security Updates: Newer versions of Java come with the latest security patches and improvements.
- Compatibility: With Cleanroom, you can bridge the gap between Minecraft 1.12.2 and newer Java versions, ensuring compatibility and stability.
Before you begin:
Switch to Prism launcher:
By far the easiest way to run Cleanroom loader is Prism Launcher. You can download prism launcher here
Install the Cleanroom MMC Instance:
MMC means MultiMC, which is what Prism Launcher is based off of. Download the latest version of the Cleanroom instance here and make sure you download the file labled "Cleanroom-MMC-Instance-(version).zip"
Make sure you have the latest version of Java 21+:
Googling "Java 21+ download wont help, so go to the Adoptium website, go to "All versions" then in the dropdown menu, scroll up and click the one at the top. Download the one on your CPU architecture and OS.
How to install
- Open prism launcher
- Click on "Add instance"
- Click on "Import"
- Import the Cleanroom instance.
Performance mods
| List of mods | Description | Curseforge link | Modrinth link | Other link |
|---|---|---|---|---|
| Fugue | Patches most of the incompatibilities between existing Forge mods and Cleanroom. | https://www.curseforge.com/minecraft/mc-mods/fugue | N/A | N/A |
| Optifine | The optimization mod we all know and love. | N/A | N/A | https://optifine.net/adloadx?f=OptiFine_1.12.2_HD_U_G5.jar |
| BlahajASM | One of the best 1.12.2 Optimizations and improvements mod. | https://www.curseforge.com/minecraft/mc-mods/blahajasm | https://modrinth.com/mod/blahajasm | N/A |
| Alfheim | An improved version of Phosphor | https://www.curseforge.com/minecraft/mc-mods/alfheim-lighting-engine | https://modrinth.com/mod/alfheim-lighting-engine | N/A |
| VintageFix | A backport of FerriteCore, Load time and RAM use optimizations for 1.12.2. | https://www.curseforge.com/minecraft/mc-mods/vintagefix | https://modrinth.com/mod/vintagefix | N/A |
| Universal Tweaks | Consolidates various bugfixes and tweaks into a single solution for Minecraft 1.12.2 | https://www.curseforge.com/minecraft/mc-mods/universal-tweaks | https://modrinth.com/mod/universal-tweaks | N/A |
Liteloader
Liteloader isn't compatible for cleanroom, but most liteloader mods have a forge port.
Final step
In the instance settings press auto-detect and click the java you just installed.
And Finally
Enjoy less ram usage and more FPS!