LagLog
A command that shows information related to your server's performance and why it could be lagging, such as TPS, TPS alerts, entities loaded, chunks…
⬇ Download on ModrinthEver Wondered Why Your Server is Lagging
Well now you can know! LagLog is a one-command tool that gives information about why your server could be lagging, such as the most entity-dense chunk per world, or chunk/entity counts. Also alerts you if your server TPS is under 15, so it's recommended to use this when you get an alert.
How to use LagLog
You can either use LagLog from the server console or by either being an operator or getting the permission. Just use /lag and you will see the information listed below, it should look something like this:
what it looks like when the command is run.
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21, 1.21.1, 1.21.2
- 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.
- Ships as laglog.jar — drop this file into the mods folder
- Download size: 4 KB
- Download link checked 22 Aug 2026 — working
These come from our own check of the pack file, not from the source page.