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Observable

See what's lagging your server.
by tasgon
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45,993,124 downloads
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Updated Jun 30, 2026
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Observable profiles (tile) entities and shows you what's taking up tick time and where. Forge and Fabric compatible. Please report any bugs on the GitHub repository here.

 

(Note: the default keybind to open profiler GUI is R.)

 

Current known issues:

  • Results screen is sometimes empty (closing and reopening the GUI fixes it)

 

FAQ:

  • Why is the mod crashing on startup with a "java.lang.NoClassDefFoundError: kotlin.jvm.<whatever>"?

The mod uses the Kotlin standard library, so please install a mod that provides that, such as Kotlin for Forge or Fabric Language Kotlin.

  • Does this mod need to be installed on the server?

In order to work, yes. Also, players can connect without the mod installed on the client, however they will not be able to use any of its features.

 

Screenshots here.

5.4.4 (neoforge)
MC NeoForge, 1.21.1
Beta 2025-06-26 Get
5.4.4 (fabric)
MC Fabric, 1.21.1, Quilt
Beta 2025-06-26 Get
7.4.4 (fabric)
MC Fabric, 1.21.4, Quilt
Beta 2025-04-08 Get
7.4.4 (neoforge)
MC 1.21.4, NeoForge
Beta 2025-04-08 Get
7.4.3 (neoforge)
MC 1.21.4, NeoForge
Alpha 2025-04-06 Get
7.4.3 (fabric)
MC Fabric, 1.21.4, Quilt
Alpha 2025-04-06 Get
5.4.3 (fabric)
MC 1.21, Fabric, 1.21.1, Quilt
Beta 2024-09-18 Get
5.4.3 (neoforge)
MC 1.21, NeoForge, 1.21.1
Beta 2024-09-18 Get
5.4.2 (fabric)
MC 1.21, Fabric, 1.21.1, Quilt
Alpha 2024-09-16 Get
5.4.2 (neoforge)
MC 1.21, NeoForge, 1.21.1
Alpha 2024-09-16 Get
4.4.2 (fabric)
MC Fabric, 1.20.1, Quilt
Beta 2024-08-19 Get
4.4.2 (forge)
MC 1.20.1, Forge
Beta 2024-08-19 Get

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