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Krypton

Mod

by tuxed

A mod to optimize the Minecraft networking stack

Type

Mod

CurseForge Downloads

36,488,622

CurseForge ID

428912

Modrinth Downloads

41,096,216

Modrinth ID

fQEb0iXm

Last Updated

Sep 12, 2026

Description

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.

Compatibility

Mod Loaders

Fabric

Game Versions

1.16.2 1.16.3 1.16.4 1.16.5 1.17 1.17.1 1.18.1 1.18.2 1.19 1.19.1 +26 more

Recommended Gear

Affiliate

Hardware and extras that pair well with this mod.

LEGO Minecraft Set

LEGO Minecraft Set

Official sets that translate the building side of the game off-screen.

View on Amazon →

As an Amazon Associate I earn from qualifying purchases.

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Included in Modpacks (879)

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SkyBlock Enhanced SkyBlock Enhanced More Biomes [FABRIC] - 1.21 UPDATE! More Biomes [FABRIC] - 1.21 UPDATE! Path of the Ascended Path of the Ascended New Simple Mods [FABRIC] - Without Complex Mods! | NEW VERSION! New Simple Mods [FABRIC] - Without Complex Mods! | NEW VERSION! Void's essentially optimized pack Void's essentially optimized pack Nvidium Performance (Full) Nvidium Performance (Full) Pixelax Pixelax Our Story - Earth 2 (soon) Our Story - Earth 2 (soon) Sodium Optimization Sodium Optimization Essential Full Potential Essential Full Potential Cozy Time | Cozy Survival with Quests (MC Cozy 1.21.1) Cozy Time | Cozy Survival with Quests (MC Cozy 1.21.1) Tropimon Tropimon MTR Operation MTR Operation All of Create Fabric All of Create Fabric CobbleGems CobbleGems [SFP] SUPER FPS FOR POTATOES (1.21.11 Updated) [SFP] SUPER FPS FOR POTATOES (1.21.11 Updated) Guns Survival Multiplayer Guns Survival Multiplayer secret's pack secret's pack Origins Revolution | With Origins & Origins Addons Origins Revolution | With Origins & Origins Addons Sebi's Distant Horizons Optimization Pack Sebi's Distant Horizons Optimization Pack OptiFinium OptiFinium ALAND's Optimized Hypixel SkyBlock ALAND's Optimized Hypixel SkyBlock Smooth Server Smooth Server Building Blocks Building Blocks Framework Framework DarkRPG REDUX - RPG with Quests, Magic. Origins, Adventure DarkRPG REDUX - RPG with Quests, Magic. Origins, Adventure Physics Modpack Plants vs. Zombies+ | With Plants vs Zombies & More! Plants vs. Zombies+ | With Plants vs Zombies & More! Actions and Smooth Actions and Smooth Crystal PvP Modpack Crystal PvP Modpack VR Medieval | Immersion plus | [FABRIC] VR Medieval | Immersion plus | [FABRIC] SparkleFlake's Optimization pack SparkleFlake's Optimization pack Sniff Client Sniff Client Melatonin Melatonin Plants vs Zombies Overgrowth Plants vs Zombies Overgrowth Vulkan Plus Vulkan Plus BlazeandCave's Advancements ModPack (BACAP) BlazeandCave's Advancements ModPack (BACAP) Crystal Verse Crystal Verse Better FPS Better FPS Ultimate CPVP Ultimate CPVP PvP Beyond PvP Beyond Cottage World Cottage World CRETANIA CRETANIA VanillaEnhanced VanillaEnhanced Alinea Essentials Alinea Essentials Uton Optimizator Uton Optimizator Mega's SkyBlock Mega's SkyBlock It Takes a Journey It Takes a Journey Drdonutt Drdonutt Technically Enhanced Technically Enhanced POKEFUN - The Ultimate Pokemon Adventure [Cobblemon} POKEFUN - The Ultimate Pokemon Adventure [Cobblemon} PVP Optimizations PVP Optimizations Truly Essentials [FABRIC] - First Step Truly Essentials [FABRIC] - First Step Vulkanix Vulkanix FPS FLAME [FABRIC] Performance Fps Boost and more FPS FLAME [FABRIC] Performance Fps Boost and more Cozy Experience - with Cute & Cozy Items! Cozy Experience - with Cute & Cozy Items! Legends Reborn: Medieval (LRM) Legends Reborn: Medieval (LRM) Deez FPS Deez FPS Keo vanilla Keo vanilla Gobba's Crystal PVP Modpack Gobba's Crystal PVP Modpack Spirity Optimized Spirity Optimized Origin Realms Beyond Origin Realms Beyond MCC Island Optimised MCC Island Optimised Terralith Adventure Terralith Adventure CoreCraft CoreCraft Modpack Essentials Modpack Essentials Azure Visuals Azure Visuals HolyWorld Plus HolyWorld Plus DexMasters [Cobblemon] DexMasters [Cobblemon] Hoplite+ Hoplite+ AzClient The Best Boosted FPS ModPack AzClient The Best Boosted FPS ModPack Modern Hypixel SkyBlock Modern Hypixel SkyBlock Realistic Minecraft Backrooms Realistic Minecraft Backrooms Diamond Age Diamond Age CobbleVerse + (For servers with friends) CobbleVerse + (For servers with friends) femboy experience femboy experience WarhammerCraft WarhammerCraft CordCraft Season 4 CordCraft Season 4 Thosh's Client Thosh's Client 3d blocks n' stuff 3d blocks n' stuff A beginning of Origins (Fabric) A beginning of Origins (Fabric) FemboyCraft FemboyCraft PikaVerse MC PikaVerse MC Conquest of the Bleak Isles Conquest of the Bleak Isles Nexus client Nexus client Majorly Optimized Majorly Optimized Not Quite Optifine Not Quite Optifine Blood on the Clocktower Blood on the Clocktower BastiGHG's CraftAttack 13 Mische BastiGHG's CraftAttack 13 Mische Simple Voice Chat - Fabric Preloaded Instance Simple Voice Chat - Fabric Preloaded Instance Cloth and Armor Cloth and Armor Oxygen Oxygen [Cobblemon] BlockeMon [Cobblemon] BlockeMon Minimoriya Pack Minimoriya Pack Cobblemon Apex Worlds Cobblemon Apex Worlds Optimized + Optimized + PVPify PVPify Performatic Performatic Turtle's Auxiliar Modpack Turtle's Auxiliar Modpack Boostify Boostify

External Resources

CurseForge Modrinth Source Code