Lag Protect
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
⬇ Download on CurseForgeThe author built this one for Minecraft 1.21.5 on Fabric. On other versions it may install and then do nothing.
Lag Protect
A lightweight, server-side Fabric mod that protects players from taking damage during lag spikes. When a player's connection stops responding, damage to them is cancelled until they catch back up, so nobody dies to a frozen screen.
How it works
The server sends each player a tiny ping on a configurable interval (default every 30 ticks). If the response is overdue by more than a second and the player has also stopped sending movement packets, they are considered lagging and incoming damage is cancelled. Protection ends the moment the client catches up.
Gamerule
/gamerule lag_protect <ticks> -- interval between pings (default 30, range 0-200, 0 disables the mod).
Lower = lag is detected faster, but packets are sent more frequently.
Notes
Protection covers damage only. A player who stays lagged past the vanilla keepalive timeout is still disconnected as normal.
License
This mod is available under the MIT license.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.5
- 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 LagProtect-1.1.4+1.21.5.jar — drop this file into the mods folder
- Download size: 27 KB
- Download link checked 28 Sept 2026 — working
These come from our own check of the pack file, not from the source page.