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WAILT Mod pour Minecraft 1.20.1, 1.12.2

Pourquoi je lag alors

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Mis à jour 18.10.2026
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Why Am I Lagging Tho is a mod designed to provide visibility into a servers performance (and connected clients)

Note: Versions 0.4.0 and above are NOT regular forge/fabric mods. This is a Java Agent, that needs to be applied via JVM arguments: -javaagent:/path/to/wailt.jar

Data is exposed via json over (secure) websocket, to be consumed by a webapp

Features

  • Websocket / Web API.
  • Optional Authentication.
  • JVM Statistics.
  • Memory.
  • Thread counts.
  • Level tick statistics.
  • TPS.
  • Mean duration.
  • Network statistics
  • Overall inbound/outbound.
  • Per player inbound/outbound.
  • Per packet inbound/outbound.
  • Custom payloads (mod channels) inbound/outbound.
  • Entity count statistics per Level.
  • Overall per level.
  • Grouped per type.
  • Grouped per chunk.
  • Block Entity tick statistics.
  • Per type.
  • Entity tick statistics
  • Per type.
  • Player join/leave events.

Comment installer WAILT

With Millida Launcher

  1. Install Millida Launcher

    The launcher is free: download it at millida.net/launcher and sign in with any nickname.

  2. Click “Install” on this page

    The launcher opens and installs the mod for Minecraft 1.12.2–1.21 on Fabric, Forge, NeoForge or Quilt automatically.

  3. Launch the game

    A profile with it appears in the launcher: click “Play”.

Manually

  1. Install Fabric, Forge, NeoForge or Quilt

    The loader must match the game version of the mod file, for example Minecraft 1.21. After installing it, a separate profile appears in your launcher.

  2. Download the file for your version

    In the version list above, pick the file WhyAmILaggingTho-0.6.7.jar (5.6 MB) for your game version and loader.

  3. Put it in the mods folder

    The folder is inside .minecraft (Windows: %appdata%\.minecraft\mods). If it does not exist, create it.

  4. Launch the loader profile

    Open “Mods” in the main menu: WAILT should be in the list.

Minecraft 1.21 runs on Java 21: with a different Java version the game may close right after launch.

Versions

Avec dépendances

MinecraftLoaderFichierDateActions
1.17.1Fabric, NeoForge, Forge, QuiltWhyAmILaggingTho-0.6.7.jar5.6 Mo
1.16.5ForgeWhyAmILaggingTho-1.16.5-0.2.1-universal.jar382 Ko

FAQ

Which Minecraft versions does WAILT work on?

There are files for 1.12.2–1.21, 36 versions in total. The newest is 1.21.

Is WAILT for Forge or Fabric?

There are files for Fabric: 1.12.2–1.21, for Forge: 1.12.2–1.21, for NeoForge: 1.12.2–1.21 and for Quilt: 1.12.2–1.21.

Does WAILT need other mods?

The author lists no required dependencies: the Fabric, Forge, NeoForge or Quilt loader is enough.

Which Java does WAILT need?

Minecraft 1.21 runs on Java 21. If the game closes right after launch, the usual cause is the wrong Java version in the profile settings.

Where can I download WAILT safely?

On this page: the file WhyAmILaggingTho-0.6.7.jar (5.6 MB) is stored on Millida’s server, with no link shorteners. SHA-1 checksum: f10a466cf9a4214e7cc267b3ce11519e994b6bd1.

Avis

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