ModsJava
WhatsMyLag
Java mod listed for Minecraft 1.20. Downloads from the MC Java Mods app on Android.
⬇ Download on Modrinth
🌀 Lag Detector — Find What’s Slowing You Down
See exactly which mods, entities, or blocks cause lag — on both client and server! A lightweight and powerful tool to track performance issues directly in-game.
💻 Client-Side Lag Analysis
Command: /whatsmylag
- Shows FPS, entity count, and top 10 nearby lag sources
- Displays mod name, entity type, distance, and lag impact (%)
- Ideal for spotting laggy builds, farms, or particles
🧠 Note: If the mod is only installed on the client, only this command will be available.
🌐 Server-Side Lag Analysis
Command: /whatsthisserverlag
- Shows server tick usage for the top 10 entities or blocks
- Displays coordinates, mod name, and performance percentage
- Perfect for diagnosing lag farms or overloaded chunks
🧠 Note: If the mod is only installed on the server, only this command will be available.
📊 Features
- ✅ Detects lag sources from any mod (Create, Minecraft, etc.)
- ✅ Clear, color-coded in-chat display
- ✅ Works in singleplayer and multiplayer
- ✅ Client and server commands work independently
- ✅ No setup — just install and type the command
🧩 Compatibility
- Supports Fabric / Quilt 1.20+
- Works alongside optimization mods like Sodium, Lithium, and FerriteCore
🧠 Perfect For
- Players who want smooth gameplay
- Server admins hunting lag farms
- Modpack developers testing performance
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20, 1.20.1, 1.20.2
- 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.
File checked by MCModsHub
- Ships as WhatsMyLag-1.0.jar — drop this file into the mods folder
- Download size: 46 KB
- Download link checked 11 Oct 2026 — working
These come from our own check of the pack file, not from the source page.