ZS Packet
Minecraft Java mod. Downloads from the MC Java Mods app on Android.
⬇ Download on CurseForgeZS Packet
Description
ZS Packet replaces Minecraft's default packet encoder/decoder with ZStandard, improving speed and giving a better compression ratio.
Required on both Client and Server side
Depends on MixinBooter and ConfigAnyTime
Performance comparison
Results below are tested by compressing 1,500 packets below 100 KB (34.0 MB in total):
Algorithm - Time used(Avg.) - Compressed size
Vanilla (Deflater) 1564 ms 3458 KB
ZS Packet (ZStandard) (Level 6) 749 ms 2718 KB
At level 6, it's 50% faster than vanilla one and also gives a better compression ratio.
FAQ
Can I join servers without ZS Packet with an installed client?
Yes.
Will servers installed this mod still be able to accept players without ZS Packet?
No, currently ZS Packet can't identify player's compression algorithm on server side.
Compatibility
ZS Packet is not compatible with Minecraft proxy software (BungeeCord, Velocity etc.), you may need to manually modify their packet decoders to make them support zstd compression.
This can be done by identifying ZS Packet's special identifier -214748999 in the EnableCompression packet.
Not compatible with PojavLauncher iOS, as there are no corresponding ZStandard JNI bindings.
- Edition: Minecraft Java
- File type: .jar
- 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 CurseForge — 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 zspacket-0.0.1.jar — drop this file into the mods folder
- Download size: 7.7 MB
- Download link checked 8 Nov 2026 — working
These come from our own check of the pack file, not from the source page.