ModsFinder

Observable

by tasgon

Observable helps server owners find what is causing lag, with a profiler that reports on the running server.

FabricForgeNeoForgeQuiltClient and serverMozilla Public License 2.0Open source1.16.5 – 1.21.4

What it does

Observable is an optimization and utility mod for diagnosing performance problems on a server. Every player and the server need a copy of the mod. Files are published for Fabric, Forge, NeoForge and Quilt across 9 release versions, 1.16.5 – 1.21.4, under the Mozilla Public License 2.0, and the source code is open.

Installation needs Architectury API and Kotlin for Forge on Forge and NeoForge, and Architectury API and Fabric Language Kotlin on Fabric, with Fabric API also required on Fabric and Quilt.

Key features

  1. Server lag diagnosis

    Shows which parts of the running server take the most time, so the cause of lag can be located.

  2. Tick timing reports

    Records how long each part of the server tick takes, so slow code paths stand out in the report.

  3. Live profiling

    Collects timing data while the server keeps running, without restarting it to start an investigation.

Compatibility

Latest build for each game version and loader.

1.21.x3 of 3 versions with builds
1.21.47.4.4+fabricNot available7.4.4+neoforge7.4.4+fabric
1.21.15.4.4+fabricNot available5.4.4+neoforge5.4.4+fabric
1.215.4.3+fabricNot available5.4.3+neoforge5.4.3+fabric
1.20.x1 of 1 version with builds
1.20.14.4.2+fabric4.4.2+forgeNot available4.4.2+fabric
1.19.x2 of 2 versions with builds
1.19.34.3.3+fabric4.3.3+forgeNot available4.3.3+fabric
1.19.23.3.1+fabric3.3.1+forgeNot available3.3.1+fabric
1.18.x2 of 2 versions with builds
1.18.22.2.3-fabric2.2.3-forgeNot availableNot available
1.18.11.2.31.2.3Not availableNot available
1.16.x1 of 1 version with builds
1.16.50.2.10.2.1Not availableNot available
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 3

Architectury APIAn intermediary api aimed to ease developing multiplatform mods.
Required
Fabric Language KotlinThis is a mod that enables usage of the Kotlin programming language for Fabric mods.
Required
Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

Questions

Does Observable have to be installed on both sides?

Yes. The server and every player need the mod installed.

Which dependencies does Observable need?

Architectury API and Kotlin for Forge on Forge and NeoForge, and Architectury API and Fabric Language Kotlin on Fabric. Fabric API is also required on Fabric.

In the catalog

Observable is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 17,979 mods support Minecraft 1.21.4.

Optimization mods3,545Fabric modsMods for 1.21.417,979

Similar mods

Sodium1.16.3 – 26.3Iris Shaders1.16.5 – 26.3Entity Cullingb1.7.3 – 26.3FerriteCore1.16.5 – 26.3ImmediatelyFast1.18.2 – 26.3Sodium Extra1.16.2 – 26.3

Official listing

Owner
tasgon
Published
2021-07-30
Updated on Modrinth
2025-06-26
Facts verified
2026-10-15

Tags

OptimizationUtility
Open on ModrinthCompare