# CaffeineMC/phosphor-fabric

A Fabric mod designed to dramatically improve the performance of Minecraft's lighting engine while fixing many bugs

Repository: https://github.com/CaffeineMC/phosphor-fabric
Canonical: https://ross.abutalabs.com/products/phosphor-fabric
Language: Java
License: LGPL-3.0
License Family: copyleft
Topics: minecraft, fabric
Archived: true
Last push: 2024-01-28T07:57:01+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2347, "days_push": 948, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1103, forks 69 (observed 2026-08-28T04:03:36.116080+00:00)

## What it is
Phosphor is a Fabric mod for Minecraft that optimizes the game's lighting engine to dramatically improve performance and fix related bugs. It works on both client and server, and servers can run it without clients installing the mod.

## Use cases
- reduce Minecraft server lag from lighting calculations
- improve Minecraft client FPS caused by the lighting engine
- optimize light updates on a Fabric modded server
- fix lighting bugs in Minecraft without changing vanilla behavior
- speed up chunk lighting when exploring new areas

## When to choose
- you run a Fabric modded client or server and want lighting performance gains
- you want vanilla-identical lighting behavior with fewer CPU cycles spent
- you need a server-side optimization that clients don't need to install

## When to avoid
- you play vanilla without mod loaders
- you use mods that drastically rewrite the lighting engine
- you need a mod actively updated for the latest Minecraft versions

## Facets
- artifact type: plugin
- maturity: maintenance
- function: game-engine
- domain: gaming-tools, performance
- platform: jvm
- tags: fabric-mod, lighting-engine, minecraft-server, minecraft-client, optimization, performance, minecraft

## Member repositories
- CaffeineMC/phosphor-fabric (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:36.116080+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:45:30.257214+00:00, confidence not recorded.
  - readme: https://github.com/CaffeineMC/phosphor-fabric (fetched 2026-08-28T04:03:36.116080+00:00, sha 33b20844e859)
- Data as of 2026-08-30T08:39:29.467469+00:00.