ZstdMC: Multiplayer Network Optimization ZstdMC is a performance-focused mod designed to optimize network bandwidth usage in multiplayer environments.
By replacing Minecraft's built-in compression and decompression modules with the Zstandard (zstd) library, this mod achieves significantly higher compression ratios, resulting in substantial data savings. In most scenarios, it provides these benefits with no negative impact on the game's stability or performance.
Key Features Bandwidth Efficiency: Saves approximately 40% to 90% of network traffic in multiplayer mode.
Low Overhead: High-performance compression that minimizes CPU resource consumption.
Easy Setup: Simply drop the mod file into both the server and client mods folders.
Configuration Requirement To enable the optimization, ensure your server's server.properties file has the following parameter set:
network-compression-threshold=128 (or higher)
Important Note on Versions Fat Version (Recommended): In most cases, you should use the Fat version, which includes all necessary libraries.
Fit Version: If you experience crashes or compatibility issues, please switch to the Fit version to resolve them.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as zstdmc-1.0-SNAPSHOT-fat.jar — drop this file into the mods folder
- Download size: 7.1 MB
- Download link checked 30 Aug 2026 — working
These come from our own check of the pack file, not from the source page.