Krypton Reforged Mod for Minecraft 1.20.1
Unofficial Forge Port of the server networking performance mod "Krypton"
- downloads
- 20 downloads
- views
- 78 views
- Updated
- Updated 03.11.2026
- 1.20 — 1.20.1
Forge
About the Krypton Reforged mod
THIS IS AN UNOFFICIAL FORGE PORT.
Please direct bug reports, questions, and everything else to the Github page linked to this Curseforge page, not the Fabric mod. The original maintainer, Tuxed, will not be providing any support for this port.
Krypton optimizes the Minecraft networking stack, meaning it mostly improves server performance with lots of clients, but is also required on the client. It derives from work done in the Velocity and Tuinity projects. Krypton contains several optimizations, including:
- Highly optimized Netty handlers derived from the Velocity proxy.
- Flush consolidation to lower server CPU usage (and reducing the impact from hardware security vulnerabilities which exploit speculative execution) and lower server tick times.
- Micro-optimizations to reduce memory usage and improve packet serialization speeds.
As for this port, it should be compatible with almost everything, as it's just a few mixins. Anything that modifies the networking stack may cause issues, but these patches are low level optimizations and unlikely to cause problems. There were issues however using jar-in-jar on 1.16, so the Velocity natives are packaged using Shade. This also seems to have packaged a few other duplicate Netty classes even with jar minimization and exclusion. It seems to work fine regardless, but if it breaks loading these classes somehow, or if anyone knows how to fix this, let me know.
Our Discord
How to install Krypton Reforged
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 mod for Minecraft 1.20–1.20.1 on Forge automatically.
Launch the game
A profile with it appears in the launcher: click “Play”.
Manually
Install Forge
The loader must match the game version of the mod file, for example Minecraft 1.20.1. After installing it, a separate profile appears in your launcher.
Download the file for your version
In the version list above, pick the file KryptonReforged-0.2.3.jar (202 KB) for your game version.
Put it in the mods folder
The folder is inside .minecraft (Windows: %appdata%\.minecraft\mods). If it does not exist, create it.
Launch the loader profile
Open “Mods” in the main menu: Krypton Reforged should be in the list.
Minecraft 1.20.1 runs on Java 17: with a different Java version the game may close right after launch.
Versions
With dependencies
| Minecraft | Loader | File | Date | Actions |
|---|---|---|---|---|
| 1.20.1 | Forge | KryptonReforged-0.2.3.jar202 KB 20 |
FAQ
Which Minecraft versions does Krypton Reforged work on?
There are files for 1.20.1, 1.20. The newest is 1.20.1.
Is Krypton Reforged for Forge or Fabric?
Only for Forge: 1.20–1.20.1. There are no files for Fabric or NeoForge: a mod for another loader will not start.
Does Krypton Reforged need other mods?
The author lists no required dependencies: the Forge loader is enough.
Which Java does Krypton Reforged need?
Minecraft 1.20.1 runs on Java 17. If the game closes right after launch, the usual cause is the wrong Java version in the profile settings.
Where can I download Krypton Reforged safely?
On this page: the file KryptonReforged-0.2.3.jar (202 KB) is stored on Millida’s server, with no link shorteners. SHA-1 checksum: 92690482dad46a8c9cf28e4b6b26e49f4dc67095.
Reviews
Be the first to rate Krypton Reforged
