Singleplayer Jitter Fix
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
Fixes all forms of jitter on single player due to server desync. Makes mobs movement and animation smooth, fixing stutters and discontinuities
⬇ Download on ModrinthSingleplayer Jitter Fix: Smooth Entity Animations
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.
Changes:
- Server and Client now tick in alternating mode. one tick one, one the other
- All entities "send" their position every tick. this means they are always 1 tick behind as opposed to several in vanilla
- Fixes entities spawned in wrong phase staritng on client with a wrong position causing entity snapback when server updates them
- Fixes falling blocks disappearing as soon as the block is placed. Now they disappear when the chunk mesh has hpdated instead, perfectluy smooth.
- 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 smooth_animations-1.21.1-1.0.2-neoforge.jar — drop this file into the mods folder
- Download size: 131 KB
- Download link checked 15 Nov 2026 — working
These come from our own check of the pack file, not from the source page.