
WhatsMyLag
Find out exactly what’s lagging your world - with mod, entity, and tick info.
Screenshots


About this Mod
🌀 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
Available Versions
How to Install WhatsMyLag on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.20.6).
Install Mod
Open the mod browser in the dashboard and search for "WhatsMyLag". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.20.6, 1.20.5, 1.20.4 (+4 more)
Server-side
~ OptionalRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
WhatsMyLag server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.20.6). You can switch loaders with one click in the panel.
Is WhatsMyLag compatible with fabric and quilt?
WhatsMyLag officially supports fabric, quilt for Minecraft 1.20.6, 1.20.5, 1.20.4. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with WhatsMyLag – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if WhatsMyLag consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
Similar Mods
Rent Modded Server
Install WhatsMyLag with just one click on your server.