Idle Boost
by Kyronis
Idle Boost lowers Minecraft's frame rate and render distance while the game window runs in the background, so the client uses less processing power when it is not in focus.
What it does
When the Minecraft window loses focus, Idle Boost reduces the frame rate and render distance so the client draws less while the player is away from the game. Settings are adjusted in a custom options menu, which lets players choose the values that apply in the background. Only the player's game needs the mod, so a server runs without it and players join without installing anything extra.
Idle Boost requires Fabric API. It is published for Fabric, Forge and NeoForge across four game versions, with the latest 1.2.0 file dated 2024-09-26. The source code and issue tracker are public, but the mod is not open source: it is covered by a custom license. Mod Menu is optional and adds access to the settings from the mod list.
Key features
Background frame limit
Lowers the frame rate while the Minecraft window is not in focus, so the client renders fewer frames when the player is elsewhere.
Background render distance
Reduces the render distance while the game runs in the background, then restores the normal value when the window returns.
Custom options menu
Background frame rate and render distance values are set in a dedicated menu inside the game, without editing files by hand.
Small file size
The mod is a light file of about 24 to 25 KB, which keeps the installation footprint minimal.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Optional 1
Use cases
Idling between sessions
A player who leaves the game running while away from the keyboard can keep background processing lower than the in-game settings alone allow.
Who it’s for: Players who keep Minecraft open in a second window or run it alongside other applications, and who want the client to draw less while it is not active.
How it compares
Dynamic FPS is also a client-side mod that works on Fabric, Forge, NeoForge and Quilt for 1.14.3 – 26.3, and it is open source under the MIT License. Idle Freeze (Server) is a different kind of mod: it runs on the server and is optional on the client, under the Apache License 2.0, published for 1.21 – 1.21.5 and not open source. Idle Boost is client-side only and runs on Fabric, Forge and NeoForge under a custom license.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Idle Boost | Fabric, Forge and NeoForge | 1.20.1 – 1.21.1 | Client-side only | 2024-09-26 |
| Dynamic FPS | Fabric, Forge, NeoForge and Quilt | 1.14.3 – 26.3 | Client-side only | 2026-09-16 |
| Idle Freeze (Server) | Fabric, Forge, NeoForge and Quilt | 1.21 – 1.21.5 | Server required, client optional | 2025-04-29 |
Questions
Does Idle Boost need Fabric API?
Do servers need Idle Boost installed?
In the catalog
Idle Boost is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from Kyronis
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What the author says
Idle Boost was created by Kyronis. This mod reduces FPS and render distance when Minecraft is running in the background. There are some advantages this mod has over other similar mods: - ⚙️ Easy to configure via a custom options menu - 🔁 Works on Fabric and NeoForge - 🧩 No dependencies required - 📦 Small and…
Official listing
- Modrinth page
- modrinth.com/mod/idle-boost
- Owner
- Kyronis
- Published
- 2024-06-30
- Updated on Modrinth
- 2024-09-26
- Facts verified
- 2026-10-15