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Krypton

Krypton

MOD
A mod to optimize the Minecraft networking stack
by tuxed
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37,303,836 downloads
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Updated Oct 14, 2026
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Server Utility
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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.

0.3.2
MC Client, Fabric, Server, 26.3
Release 2026-09-30 Get
0.3.1
MC Client, Fabric, Server, 26.2
Release 2026-07-14 Get
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
0.2.7
MC 1.20.5, Fabric, Client, 1.20.6, Server
Release 2024-04-30 Get
Krypton 0.2.6
MC 1.20.2, Fabric, Client, 1.20.3, 1.20.4, Server
Release 2024-01-02 Get
Krypton 0.2.5
MC 1.20.2, Fabric, 1.20.3, 1.20.4
Release 2023-12-30 Get
Krypton 0.2.4
MC 1.20.2, Fabric, Client, 1.20.3, 1.20.4, Server
Release 2023-09-23 Get
Krypton 0.2.3
MC Fabric, Client, 1.20.1, 1.20, Server
Release 2023-06-10 Get
Krypton 0.2.2
MC 1.19.4, Fabric, Client, Server
Release 2023-03-16 Get
Krypton 0.2.1
MC 1.19.3, Fabric, 1.19.2, 1.19.1
Release 2022-07-30 Get
Krypton 0.2.0
MC Fabric, Quilt, 1.19
Release 2022-06-08 Get
Krypton 0.1.9
MC 1.18.1, Fabric, 1.18.2
Release 2022-03-09 Get
Krypton 0.1.7
MC 1.18.1, Fabric, 1.18.2
Release 2022-03-01 Get
Krypton 0.1.6
MC 1.18.1, Fabric
Release 2021-12-11 Get
Krypton 0.1.5
MC Fabric, 1.18
Release 2021-11-30 Get
Krypton 0.1.4
MC 1.17.1, Fabric
Release 2021-07-06 Get
Krypton 0.1.3
MC 1.17, Fabric
Release 2021-06-08 Get
Krypton 0.1.2
MC 1.16.3, Fabric, 1.16.5, 1.16.4, 1.16.2
Release 2021-02-11 Get
Krypton 0.1.1
MC 1.16.3, Fabric, 1.16.5, 1.16.4, 1.16.2
Release 2021-01-20 Get
Krypton 0.1.0 (for Minecraft 1.16.x)
MC 1.16.3, 1.16.1, 1.16, Fabric, 1.16.4, 1.16.2
Alpha 2020-12-16 Get

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