ModsFinder

Hibernate Fabric

by VoxelBill

Hibernate Fabric lets a Minecraft Fabric server put itself into a lighter idle state, cutting CPU use while no players are online.

FabricServer-side onlyGNU Lesser General Public License v3.0 onlyOpen source1.21.9 – 26.3

What it does

When no players are connected, the server snooze-states instead of keeping the full tick loop running. Hibernate Fabric handles this on its own once installed, so the server wakes again when a player joins.

Fabric API is required, and the mod is set up for servers only, so players join without installing anything. Its files cover 1.21.9 – 26.3, with builds for 26.1, 26.1.1, 26.1.2, 26.2 and 26.3 alongside 1.21.9, 1.21.10 and 1.21.11. Snapshot builds are published.

Key features

  1. Idle server sleep

    The server reduces CPU work during idle periods, which lowers the load on the host machine.

  2. Automatic activation

    Once installed, the mod takes over idle handling without commands or per-world setup.

  3. Vanilla hibernation override

    Setting pause-when-empty-seconds to 0 turns off the vanilla hibernation system so the two do not overlap.

  4. Source and issue tracker

    Source code and an issue tracker are public for anyone who wants to report a problem or read the implementation.

Compatibility

Latest build for each game version and loader.

26.31.2.1+mc26.3
26.21.2.1+mc26.2
26.1.21.2.1+mc26.1
26.1.11.2.1+mc26.1
26.11.2.1+mc26.1
1.21.111.2.1+mc1.21.11
1.21.101.2.0+mc1.21.9
1.21.91.2.0+mc1.21.9
ReleaseBetaAlphaNot available

This mod also publishes snapshot builds. Snapshots are not shown in the matrix.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

Use cases

Home or small community servers

Servers that sit empty for long stretches can use the idle state to cut the power a host draws.

Hosts paying for compute

Operators billed by CPU time see less work while the server has no players.

Who it’s for: Owners of Fabric servers who want to reduce idle resource use. The mod does nothing on a client.

Questions

Does Hibernate Fabric need Fabric API?

Yes. Fabric API is listed as a required dependency and must be installed on the server next to Hibernate Fabric.

Do players need to install the mod?

No. Players join without it, since only the server has to run the mod.

Does it conflict with the vanilla hibernation system?

It can. Setting pause-when-empty-seconds to 0 in server.properties disables the vanilla system so the two do not overlap.

Which Minecraft versions are supported?

Files exist for 1.21.9 – 26.3, the latest being 1.2.1+mc26.3 for 26.3, published on 2026-10-14.

In the catalog

Hibernate Fabric is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 8,071 mods support Minecraft 26.3.

Optimization mods3,545Fabric modsMods for 26.38,071

More from VoxelBill

All projects
26.1 Backport1.21.11 – 26.1.2Easy Data Fix1.21 – 26.3Intentional Pickup26.2 – 26.3

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

What the author says

Lets your Minecraft Fabric server snooze when idle, slashing CPU usage without missing a block! Official support for NeoForge is in development and should be available soon for all supported versions!
VoxelBill, on the Modrinth page

Official listing

Owner
VoxelBill
Published
2025-11-27
Updated on Modrinth
2026-10-14
Facts verified
2026-10-15

Tags

ManagementOptimization
Open on ModrinthCompare