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Krypton
Modrinth Mod

Krypton

A mod to optimize the Minecraft networking stack

Minecraft product info

Important product information

Compatibility, Minecraft versions, loaders, and external source data.

Type

Mod

Access

Free

Latest version

0.3.1

Downloads

36 504 524

Loaders / Platforms

fabric

Minecraft versions

1.16.2 – 1.17.1 1.18.1 – 1.21.11 26.1 26.1.1 26.1.2 26.2

Categories

optimization utility

Description

Detailed information

## 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](https://github.com/sponsors/astei) 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](https://velocitypowered.com/) and [Tuinity](https://github.com/Spottedleaf/Tuinity) projects. Krypton contains several optimizations, including: * **Highly optimized Netty handlers** derived from the [Velocity](https://velocitypowered.com) proxy, which I am the developer of. These handlers have seen 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. ## 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.

Developer

astei

Profile and data retrieved from Modrinth

Open on Modrinth

Product gallery

Project images

Screenshots and images from the original Modrinth page.

No images yet

The project author has not added a gallery on Modrinth.

Change log

Project versions

Published versions and original Modrinth files.

0.3.1 Current Release 14.07.2026

Krypton 0.3.1

Supported Minecraft versions
26.2
Loaders / Platforms
fabric
Show changes
* Update for Minecraft 26.2
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0.26 MB

0.3.0 Release 21.04.2026

Krypton 0.3.0

Supported Minecraft versions
26.1 26.1.1 26.1.2
Loaders / Platforms
fabric
Show changes
* Update to Minecraft 26.1 Sorry for the delay. My real life job leaves little time for Minecraft.
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0.26 MB

0.2.10 Release 05.10.2025

Krypton 0.2.10

Supported Minecraft versions
1.21.9 1.21.10 1.21.11
Loaders / Platforms
fabric
Show changes
* Update for Minecraft 1.21.9
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0.26 MB

0.2.9 Release 29.03.2025

Krypton 0.2.9

Supported Minecraft versions
1.21.5 1.21.6 1.21.7 1.21.8
Loaders / Platforms
fabric
Show changes
* Update to Minecraft 1.21.5 * Resync network handlers from upstream
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0.26 MB

0.2.8 Release 22.06.2024

Krypton 0.2.8

Supported Minecraft versions
1.21 1.21.1 1.21.2 1.21.3 1.21.4
Loaders / Platforms
fabric
Show changes
* Update to 1.21 (@BenCat07)
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0.15 MB

0.2.7 Release 30.04.2024

Krypton 0.2.7

Supported Minecraft versions
1.20.5 1.20.6
Loaders / Platforms
fabric
Show changes
* Update for Minecraft 1.20.5/1.20.6
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0.16 MB

0.2.6 Release 02.01.2024

Krypton 0.2.6

Supported Minecraft versions
1.20.2 1.20.3 1.20.4
Loaders / Platforms
fabric
Show changes
* Fixes a memory leak.
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0.16 MB

0.2.5 Release 30.12.2023

0.2.5

Supported Minecraft versions
1.20.2 1.20.3 1.20.4
Loaders / Platforms
fabric
Show changes
* Fixes an incompatibility with Fabric API 0.9.1 and above. See also #111 * Resync compress handler with Velocity
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0.16 MB

0.2.4 Release 23.09.2023

0.2.4

Supported Minecraft versions
1.20.2 1.20.3 1.20.4
Loaders / Platforms
fabric
Show changes
* Updated to Minecraft 1.20.2 * Add `krypton.permit-oversized-packets` system property to permit oversized packets. Defaults to `false` for security reasons.
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0.16 MB

0.2.3 Release 10.06.2023

0.2.3

Supported Minecraft versions
1.20 1.20.1
Loaders / Platforms
fabric
Show changes
* Updated to Minecraft 1.20 * Removed a mixin that is now implemented in the base game * Improved protocol conformance - Krypton now handles servers dynamically disabling and re-enabling compression * Added events indicating when certain events in the network pipeline happen that mods can snoop on * As a consequence of this, the old ViaFabric hooks have been removed.
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0.18 MB

0.2.2 Release 16.03.2023

0.2.2

Supported Minecraft versions
1.19.4
Loaders / Platforms
fabric
Show changes
Thanks to DrexHD for the update to Minecraft 1.19.4! * Update to Minecraft 1.19.4 * Updated `velocity-native`
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0.18 MB

0.2.1 Release 30.07.2022

0.2.1

Supported Minecraft versions
1.19.1 1.19.2 1.19.3
Loaders / Platforms
fabric
Show changes
* Update to Minecraft 1.19.1 (contributed by @wafflecoffee) * Fixed Multiconnect mod compatibility
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0.17 MB

0.2.0 Release 08.06.2022

0.2.0

Supported Minecraft versions
1.19
Loaders / Platforms
fabric
Show changes
This is not just a Minecraft 1.19 update, it's also a feature release! * Fixes crash with Lithium on Quilt * Resynced with latest Velocity code * Send chunk packets in a spiral pattern and other fixes (contributed by @solonovamax)
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0.14 MB

0.1.9 Release 09.03.2022

0.1.9

Supported Minecraft versions
1.18.1 1.18.2
Loaders / Platforms
fabric
Show changes
Fixes a regression with 0.1.8.
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0.13 MB

0.1.7 Release 01.03.2022

0.1.7

Supported Minecraft versions
1.18.1 1.18.2
Loaders / Platforms
fabric
Show changes
Fix compatibility with 1.18.2
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0.12 MB

0.1.6 Release 11.12.2021

0.1.6

Supported Minecraft versions
1.18.1
Loaders / Platforms
fabric
Show changes
* Updated to Minecraft 1.18.1
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0.12 MB

0.1.5 Release 30.11.2021

0.1.5

Loaders / Platforms
fabric
Show changes
* Updated to Minecraft 1.18 * Fixed connecting to certain misbehaving server implementations * Added optimizations for the Minecraft entity tracker: * Optimized passenger check for the common case where there are no passengers riding an entity. * Optimized chunk sending to only track entities the player is nearby to
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0.12 MB

0.1.4 Release 06.07.2021

0.1.4

Supported Minecraft versions
1.17.1
Loaders / Platforms
fabric
Show changes
Compatible with Minecraft 1.17.1
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0.12 MB

0.1.3 Release 08.06.2021

0.1.3

Supported Minecraft versions
1.17
Loaders / Platforms
fabric
Show changes
* Updated to Minecraft 1.17. (This release is not compatible with Minecraft 1.16.5 and earlier.) * Added VarInt writing optimizations. * Fixed packet sending counter. * Fixed ViaFabric incompatibility.
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0.12 MB

0.1.2 Release 11.02.2021

0.1.2

Supported Minecraft versions
1.16.2 1.16.3 1.16.4 1.16.5
Loaders / Platforms
fabric
Show changes
Fixed several issues with flush consolidation
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0.11 MB

0.1.1 Release 20.01.2021

0.1.1

Supported Minecraft versions
1.16.2 1.16.3 1.16.4 1.16.5
Loaders / Platforms
fabric
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0.11 MB

0.1.0 Release 21.12.2020

0.1.0

Supported Minecraft versions
1.16.2 1.16.3 1.16.4
Loaders / Platforms
fabric
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0.1 MB