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 Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.4).
Install Mod
Open the mod browser in the dashboard and search for "Lazy Chunks". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
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
Lazy Chunks server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.4). You can switch loaders with one click in the panel.
Is Lazy Chunks compatible with fabric?
Lazy Chunks officially supports fabric for Minecraft 1.21.4, 1.21.3, 1.21.2. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Lazy Chunks – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Lazy Chunks consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Lazy Chunks with just one click on your server.