Memory Leak FixMods · 1.16 – 1.20A mod that fixes random memory leaks for both the client and server
Free38,903,965 downloads
Fixes all forms of jitter on single player due to server desync. Makes mobs movement and animation smooth, fixing stutters and discontinuities
Direct download from Modrinth · 5 downloads
Singleplayer Jitter Fix is a mod made by MehVahdJukaar. Fixes all forms of jitter on single player due to server desync. Makes mobs movement and animation smooth, fixing stutters and discontinuities.
It supports Minecraft 1.21. It has been downloaded 5 times on Modrinth. The last update came out on Nov 13, 2026.
Singleplayer Jitter Fix has had 5 releases on Modrinth since Nov 12, 2026. 5 of them came out in the past year. The newest is 1.21.1-1.0.2, released on Nov 13, 2026. It is made for Minecraft 1.21.1. It runs on NeoForge. The download is 131 KB.
| Version | Released | Minecraft | Type |
|---|---|---|---|
1.21.1-1.0.2 | Nov 13, 2026 | 1.21.1 | Release |
1.21.1-1.0.2 | Nov 13, 2026 | 1.21.1 | Release |
1.21.1-1.0.2 | Nov 13, 2026 | 1.21.1 | Release |
1.21.1-1.0.2 | Nov 13, 2026 | 1.21.1 | Release |
1.21.1-1.0.1 | Nov 12, 2026 | 1.21.1 | Release |
Ever since beta 1.3 the game has been PLAGUED by this very controlversion change: The client- serveer split.
If you dont know even on singleplayer your client runs a internal SERVER!
This causes a slew of desyncs and jittery behavior that is completley avoidable in single player.
This mod is simple in scope and simply addresses this issue with a series of targeted chanfes that fix all known smoothness issues.
Written by MehVahdJukaar. Read it with pictures on Modrinth.
This mod runs only on your own game. Servers do not need it, so you can use it on any server.
Install Fabric and NeoForge for Minecraft 1.21.
Download the .jar file from Modrinth and put it in the mods folder of your .minecraft directory.
Start Minecraft with the Fabric profile.
Easier: in Prism Launcher or the Modrinth App, search for Singleplayer Jitter Fix in your instance's mods and click Install. It adds the loader and the mods it needs for you.
Full guide: How to install Minecraft mods
| Resource | Downloads | Versions | Last update | Price |
|---|---|---|---|---|
| Singleplayer Jitter Fixthe one you looked at | 5 | 1.21 | 20 hours ago | Free |
| Memory Leak FixFX | 38.9M | 1.16 – 1.20 | Jan 6, 2024 | Free |
 Model Gap FixMehVahdJukaar | 33.8M | 1.18 – 1.21 | Oct 14, 2025 | Free |
 Lithiumjellysquid3 | 143.1M | 1.16 – 26.x | 16 days ago | Free |
Not yet. The newest version it supports is Minecraft 1.21.
Yes. Singleplayer Jitter Fix is free to download from Modrinth.
Client-side. Singleplayer Jitter Fix goes in your own mods folder and works on any server, including servers without mods.
Yes. The last update came out in the past day.
The closest ones are Memory Leak Fix, Model Gap Fix and Lithium. Compare all alternatives
Memory Leak FixMods · 1.16 – 1.20A mod that fixes random memory leaks for both the client and server
Model Gap FixMods · 1.18 – 1.21Fixes gaps in Block Models and Item Models
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DebugifyMods · 1.18 – 26.xFixes Minecraft bugs found on the bug tracker
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