Why Starlight (Fabric) is a top-tier mod mod for Minecraft 1.20.4
Rewrites the light engine to fix lighting performance and lighting errors
โ๏ธ Quick Resource Specs
| Mod Creator | Spottedleaf |
| Latest Version | 1.20.4 |
| Supported Game Versions | 1.20.4 |
| File Size | 123.45 KB |
| Last Updated | |
| Total Downloads | 22,115,388 downloads |
Starlight
Fabric mod for rewriting the light engine to fix lighting performance and lighting errors.
Future updates past 1.20
Please see: https://gist.github.com/Spottedleaf/6cc1acdd03a9b7ac34699bf5e8f1b85c
This project is available as a part of Moonrise
Compatibility
Starlight can be installed either on the dedicated server or client. It is not required to be installed on both sides. If you have Starlight on the server, clients can use Vanilla/Phosphor/Starlight to connect. Likewise, if you have Starlight on the client, you can connect to Vanilla/Phosphor/Starlight servers.
Starlight cannot be installed with Phosphor, they are completely incompatible. Browsing through Starlight's Issue Tracker will show further mod incompatibilities. Starlight is a rather destructive light engine rewrite, so it should be expected to break mods more often.
Purpose
Starlight was developed for higher scale dedicated servers, as they suffered performance problems due to how ungodly slow the light engine was. The only solution was to create an extremely invasive mod which rewrote the entire light engine. I ported the mod to fabric so that I can update it during snapshots, and decided that publishing it for all users, especially client users, would be beneficial. However, it does have the downside of being an invasive mod: Being invasive didn't affect higher scale servers because they run on Bukkit.
Further reading on the technical details of how Starlight achieves its performance can be read here: TECHNICAL_DETAILS.md
Performance for 1.20:
Here are a few graphs showing performance in 2 areas on: Block editing at high y-levels, and normal block light updates:
Light engine time chunk generation Graph has been removed as a benchmark as it is invalid for 1.20. Starlight and Vanilla are close enough on 1.20 that
this test is also useless.

Performance for 1.19.4 and below:
Here are a few graphs showing performance in 3 critical areas: Chunk generation, Block editing at high y-levels, and normal block light updates:

The Ultimate Guide to Starlight (Fabric)
If you are exploring the vast world of Minecraft modifications, Starlight (Fabric) by Spottedleaf is a standout mod that deserves your attention. With over 22,115,388 downloads, it has become a staple for players looking to enhance their experience. As the creator describes it, this project is "Rewrites the light engine to fix lighting performance and lighting errors ". Whether you are a veteran builder constructing massive cities, or simply a casual player looking to upgrade your survival world, this guide will provide you with all the essential details on how Starlight (Fabric) alters the game.
What Makes It Special?
Unlike standard mods that simply alter superficial elements, Starlight (Fabric) digs deep into the game's engine to provide a cohesive, performance-focused experience. Spottedleaf has clearly spent significant time refining the project to ensure that every aspect feels polished and responsive for version 1.20.4.
Installation Guide
Getting Starlight (Fabric) up and running is straightforward. Follow these step-by-step instructions:
- Verify Your Version: Ensure your Minecraft launcher is set to version 1.20.4.
- Install Mod Loader (if required): If this is a mod, download the compatible loader (Forge, Fabric, NeoForge).
- Download the File: Click the secure download button above to retrieve the official file from CurseForge.
- Move the File: Place the downloaded file into your `mods`, `shaderpacks`, or `resourcepacks` folder depending on the mod type.
- Launch and Enjoy: Open Minecraft, navigate to the respective settings menu, and activate Starlight (Fabric).
Compatibility & Performance
Compatibility is robust. Starlight (Fabric) is designed specifically for version 1.20.4, taking full advantage of the latest engine optimizations. Since this is heavily focused on optimization, you can expect significant frame rate improvements on both low-end and high-end hardware.