
Lumi Lighting Engine Optimizer
Improves world generation speed, reduces server lag, and fixes lag spikes on client by optimizing the Minecraft lighting engine. Based on Phosphor.
About this Mod
A full replacement of the Minecraft lighting engine with an extendable API, shipping
with Phosphor as a
reference implementation.
Dependencies
Performance
The main performance improvement comes from the fact that the lighting engine is evaluated "lazily", thus it is able to batch more lighting updates
into a single pass.
Here are some simple to understand values, generated via profiling a pre-set test case:
Test Case
- World Type: Default
- World Seed: 123
- Game Mode: Creative
- Render Distance: 16
Profiler is started right before clicking Create New World, and stopped after 10 seconds of flying in a straight line in creative mode.
Without Lumi, the active server time spent in lighting engine is 34% of the total active server time (not counting when the server thread is sleeping).
With Lumi, this fraction goes down to 13%, or an approximately 2.5x performance increase over vanilla.
Flame Graphs
Horizontal axis is time, vertical axis is the call stack. The blue highlighted parts are calls to the lighting engine update method.


Incompatibilities
- ArchaicFix: Config Change Needed
- As both mods replace the same parts of code, naturally you will need to set
enablePhosphortofalsein the
ArchaicFix config.
- As both mods replace the same parts of code, naturally you will need to set
- CoreTweaks: Config Change Needed
- The
fix_heightmap_rangefeature is already implemented in Lumi's lighting engine. Set it tofalsein the
CoreTweaks config.
- The
Both of these configs will be automatically modified by Lumi automatically when you launch the game, so you shouldn't even
need to edit the config files manually.
Authors
Credits
- embeddedt
- The initial port
of Phosphor into 1.7.10
- The initial port
- CaffeineMC
- Creating the original Phosphor
Available Versions
How to Install Lumi Lighting Engine Optimizer on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set forge Loader
In the panel under "Egg", select the forge loader and matching Minecraft version (1.7.10).
Install Mod
Open the mod browser in the dashboard and search for "Lumi Lighting Engine Optimizer". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.7.10
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Lumi Lighting Engine Optimizer server crashes on startup – what to do?
Most common cause: wrong forge 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 (1.7.10). You can switch loaders with one click in the panel.
Is Lumi Lighting Engine Optimizer compatible with forge?
Lumi Lighting Engine Optimizer officially supports forge for Minecraft 1.7.10. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Lumi Lighting Engine Optimizer – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Lumi Lighting Engine Optimizer 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 Lumi Lighting Engine Optimizer with just one click on your server.