Lazy Chunks
Reduces stutters by spreading chunk loading across multiple frames
About this Mod
LazyChunks
A Fabric client-side mod that reduces chunk loading stutters by dynamically spreading chunk processing across multiple frames based on your current FPS.
What It Does
LazyChunks monitors your real-time FPS and limits how much chunk work is processed each frame.
When FPS drops below a configurable threshold, chunk loading is slowed down instead of causing sudden frame drops.
When FPS is high, chunks load faster to keep the world responsive.
This results in smoother gameplay, especially during fast movement, elytra flight, or exploration.
Configuration
Config file is created at .minecraft/config/lazy_chunks.json on first launch.
| Option | Default | Description |
|---|---|---|
| lazyChunkLoadingEnabled | true | Enable/disable the mod |
| targetFps | 60 | Baseline FPS for budget calculation |
| fpsThreshold | 80 | FPS above which throttling is disabled (vanilla behavior) |
| baseWeightPerFrame | 3.0 | Base amount of chunk work allowed per frame at target FPS |
| maxFrameTimePercent | 12.0 | Max percentage of frame time for chunk processing (1-20) |
| proactiveThrottling | true | Reduce budget when frame times are unstable |
| teleportProtection | true | Extra conservative throttling after teleports/dimension changes |
| minimumBudget | 3.0 | Minimum weight budget to prevent complete stalls |
Debug
Press F3 to see real-time throttling stats in the debug overlay.
Compatibility
Designed to work alongside Sodium, Lithium, and other optimization mods (different layers of the pipeline). If you encounter issues, please report them here.
License
Licensed under LGPL-3.0
Available Versions
How to Install Lazy Chunks on Your Client
Install the Mod Loader Locally
Install fabric for your local Minecraft version.
Download the Matching File
Choose the Lazy Chunks file for fabric and Minecraft 1.21.4.
Install Mod
Place the .jar file in your local .minecraft/mods folder and restart Minecraft. No server-side installation is required.
Compatibility
Mod Loaders
Minecraft Versions
1.21.4, 1.21.3, 1.21.2 (+2 more)
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Does Lazy Chunks need to be installed on the Minecraft server?
No. Modrinth marks Lazy Chunks as unsupported on the server side. Install it only in your local Minecraft mods folder. Your server can remain unchanged unless the mod page lists an additional dependency.
Which version and loader does Lazy Chunks require?
Use a file for fabric and your exact Minecraft version. Supported versions include 1.21.4, 1.21.3, 1.21.2. Files for different loaders are not interchangeable.
Lazy Chunks is not working – what should I check?
First check the Minecraft version, loader version and required dependencies. Put the .jar file in your local .minecraft/mods folder and remove older duplicates. Because this mod is client-side, adding server RAM will not fix it.
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