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Krypton

A mod to optimize the Minecraft networking stack
by tuxed
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34,054,496 downloads
0 likes
Updated Jun 30, 2026
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Warning

Krypton is a work-in-progress. I do not provide any guarantees about its stability, compatibility with other mods, or support for every possible setup out there. Support for this mod is provided on a "best-effort" basis. This is not my day job, it is a hobby growing out of related work I've done.

Sponsor Me!

Did this mod make your server playable? Chip in a bit of money so I can continue developing it.

What's Krypton?

Krypton (from Ancient Greek kryptos, "the hidden one") is a Fabric mod that attempts to optimize the Minecraft networking stack. 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, which I am the developer of. These handlers have sen real-world usage and extensive profiling, and strategically deploy native code where it makes the most sense.
  • 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.

Please join my Discord to discuss the mod or get support.

Compatibility

Krypton should work anywhere where a Minecraft can run — naturally, however, it is tuned for Linux.

I try to ensure that Krypton will work with the Fabric API, Lithium, and Sodium. Support beyond these mods is provided on a best effort basis.

0.3.0
MC Fabric, 26.1, 26.1.1, 26.1.2
Release 2026-04-21 Get
0.2.10
MC Client, Fabric, Server, 1.21.9, 1.21.10, 1.21.11
Release 2025-10-05 Get
0.2.9
MC 1.21.5, Fabric, 1.21.7, 1.21.6
Release 2025-03-29 Get
0.2.8
MC 1.21, Fabric, Client, 1.21.4, 1.21.3, 1.21.1, Server, 1.21.2
Release 2024-06-22 Get

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