AutoHibernate
by DerLuuz
AutoHibernate lets a Fabric server enter deep hibernation when no players are connected, then wake the moment someone joins.
What it does
While nobody is online, the server stops using most of its processing time and keeps the world exactly as the last player left it. Block updates, entity movement, crop growth and random ticks are all paused, so nothing changes until the server resumes. Commands typed into the server console still run during hibernation.
Resuming is meant to be quick: a player connecting wakes the server, and the wake-up is intended to happen without a noticeable delay. The mod is server-side only, so players join without installing anything. Requires Fabric; no other mod loader is supported, and porting to Forge, NeoForge or Paper is not planned. Files exist for Fabric only, covering 1.21.11 – 26.2 across five release versions, with 1.3.0 for 26.2 as the latest file.
The project is open source under the MIT License and publishes its source code. It was first released on 2026-05-03 and last updated on 2026-09-12. Snapshot support is not stated, so a newer version may need the author's update before it is used.
Key features
Deep hibernation
The server enters a low-activity state automatically once no players are connected.
Frozen world state
Block updates, entity movement, crop growth and random ticks stop, and in-game time stops ticking too.
Console commands during hibernation
Commands entered in the server console keep working while the server is hibernating.
Instant resume
A connecting player wakes the server, which is intended to avoid visible lag at login.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Quiet survival servers
A world that often sits empty can keep its state while the server uses far less processing power.
Low-population hosts
Hosts with few regular players can run the server on fewer resources between sessions.
Who it’s for: Server owners who run Fabric servers with long idle periods and want to reduce CPU use between sessions. Players need no installation.
How it compares
ClockStopper is server-side only, open source under the MIT License and published for 1.21.1 – 1.21.11 on Fabric, so it covers an earlier range than AutoHibernate. Hibernate Fabric is also server-side only and open source, but under the GNU Lesser General Public License v3.0 only, with files for 1.21.9 – 26.3. Idle Freeze (Server) differs in environment: the server is required and the client is optional, it loads on Fabric, Forge, NeoForge and Quilt, and its license is the Apache License 2.0.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| AutoHibernate | Fabric | 1.21.11 – 26.2 | Server-side only | 2026-09-12 |
| ClockStopper | Fabric | 1.21.1 – 1.21.11 | Server-side only | 2026-02-09 |
| Hibernate Fabric | Fabric | 1.21.9 – 26.3 | Server-side only | 2026-10-14 |
| Idle Freeze (Server) | Fabric, Forge, NeoForge and Quilt | 1.21 – 1.21.5 | Server required, client optional | 2025-04-29 |
Questions
Does AutoHibernate need to be installed on the client?
Which loader does AutoHibernate use?
Can a server run commands while it is hibernating?
In the catalog
AutoHibernate is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 13,894 mods support Minecraft 26.2.
More from DerLuuz
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What the author says
AutoHibernate is a server-side Fabric mod that automatically puts your Minecraft server into deep hibernation when no players are connected, and seamlessly wakes it up the moment someone joins. By hibernating the server, you save significant CPU and power resources while keeping your world exactly as players left it…
Official listing
- Modrinth page
- modrinth.com/mod/autohibernate
- Owner
- DerLuuz
- Published
- 2026-05-03
- Updated on Modrinth
- 2026-09-12
- Facts verified
- 2026-10-15