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Krypton

Mod

by tuxed

A mod to optimize the Minecraft networking stack

Type

Mod

CurseForge Downloads

37,867,215

CurseForge ID

428912

Modrinth Downloads

44,882,593

Modrinth ID

fQEb0iXm

Last Updated

Nov 7, 2026

Description

Warning

I do not provide any guarantees about Krypton's stability, compatibility with other mods, or support for every possible setup out there.

Support for this mod is provided on a "best-effort" basis.

I have held down a very demanding job since November 2021. I consider this mod to be effectively feature-stable and will generally only provide updates for new Minecraft versions on an as-needed basis, based on my personal availability.

Don't ask if you can adopt this mod. I've done this few times before. It has not gone well, so don't ask.

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.

Compatibility

Mod Loaders

Client Fabric Server

Game Versions

26.3

Recommended Gear

Affiliate

Hardware and extras that pair well with this mod.

Mini PC for self-hosting

Mini PC for Self-Hosting

A low-power box that can sit in a cupboard and run a modded server around the clock.

View on Amazon →

As an Amazon Associate I earn from qualifying purchases.

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Included in Modpacks (1,024)

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New Revolution - An Improved Vanilla Experience | 1.21 UPDATE! Vanilla+ Lightweight | MC Vanilla+ 1.21.11 Vanilla+ Lightweight | MC Vanilla+ 1.21.11 FPSBOOST FPSBOOST Origins++ Modpack Origins++ Modpack Sensible MC Sensible MC More FPS [FABRIC] - SHADERS 1.21.11! More FPS [FABRIC] - SHADERS 1.21.11! Better Realism MC | Vanilla+ & Realism (Based on RealismCraft) Better Realism MC | Vanilla+ & Realism (Based on RealismCraft) Cobblemon Cobbletwo X MegaShowdown [1.7.3] (Pokemon Modpack) Cobblemon Cobbletwo X MegaShowdown [1.7.3] (Pokemon Modpack) Speed Of Light FPS Booster (SOL) With Shaders Speed Of Light FPS Booster (SOL) With Shaders Essentials Mods [FABRIC] - 1.21 RELEASE! Essentials Mods [FABRIC] - 1.21 RELEASE! VR experience | Immersion plus | [FABRIC] - [ 1.21.5!!] VR experience | Immersion plus | [FABRIC] - [ 1.21.5!!] Fabri's Frontiers Fabri's Frontiers More Animals [FABRIC] - 1.21 UPDATE! More Animals [FABRIC] - 1.21 UPDATE! Vulkan Optimization Vulkan Optimization Origins SMP Origins SMP Voxyris Voxyris Keo Vanilla Keo Vanilla Feather | Lightweight Vanilla+ Modpack Feather | Lightweight Vanilla+ Modpack Fuller's PokePack: cobblemon / pokemon modpack Fuller's PokePack: cobblemon / pokemon modpack Actions on Java Actions on Java Enhanced FPS Enhanced FPS Medieval Immersed Medieval Immersed Sodium Optimization Sodium Optimization Roanoke Cobblemon Roanoke Cobblemon Kooplemon Kooplemon Easycraft (Official) Easycraft (Official) Cobblemon Apex Cobblemon Apex OpalFab (OptiFine alternatives on Fabric) OpalFab (OptiFine alternatives on Fabric) PvP Optimized PvP Optimized Survival Tools Survival Tools Cobblemon Plus+ The Top Pokemon Adventure in Cobblemon - Cobblemon 1.7.3 - Mega Cobblemon - Pokemon Legendaries - Fully Optimize Cobblemon Plus+ The Top Pokemon Adventure in Cobblemon - Cobblemon 1.7.3 - Mega Cobblemon - Pokemon Legendaries - Fully Optimize Nizco's Cobblemon Adventures 2 Nizco's Cobblemon Adventures 2 More Decorations [FABRIC] - 1.21 UPDATE! 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(with cosmetics, fullbright, keystrokes, minimap and more) oopsi! your everyday modpack! (with cosmetics, fullbright, keystrokes, minimap and more) Cozy Time | Cozy Survival with Quests (MC Cozy 1.21.1) Cozy Time | Cozy Survival with Quests (MC Cozy 1.21.1) Dungeons & Mineshafts: 5th Edition Dungeons & Mineshafts: 5th Edition Shaders - Working Shaders - Working MTR Railway Network Access - Standard Edition MTR Railway Network Access - Standard Edition ALAND's Immersive Hypixel SkyBlock ALAND's Immersive Hypixel SkyBlock More Realistic [FABRIC] - 1.21 UPDATE! More Realistic [FABRIC] - 1.21 UPDATE! Fiyrthgu's Hypixel Skyblock Modpack Fiyrthgu's Hypixel Skyblock Modpack Nizco's Cobblemon Horizons Nizco's Cobblemon Horizons Fps+ BOOST FPS Fps+ BOOST FPS Fabric Boosted Fabric Boosted Nizco's Cobblemon Adventures Nizco's Cobblemon Adventures Newt+ (Sodium Edition) Newt+ (Sodium Edition)

External Resources

CurseForge Modrinth Source Code