Fabric is often the go-to modloader for those looking to have the closest experience to vanilla without major gameplay changes. This guide recommends performance-enhancing mods for your Fabric Minecraft server across different Minecraft versions.
Prerequisites
Before following this guide, complete the general Performance Guide for all Minecraft servers. Fabric must already be installed, and mods need uploading to the server's mods folder.
Recommended Mods By Version
Fabric 1.21.1 And Beyond
- Lithium — One of the most important mods for performance on a server. Optimizes gameplay logic without changing vanilla mechanics.
- FerriteCore — Provides moderate RAM usage reduction through block state and location patches.
- ModernFix — Resolves bugs while improving startup time and memory footprint.
- Krypton — Enhances connection stability via network stack optimization.
- Structure Layout Optimizer — Accelerates structure generation, particularly for larger modded structures.
- Alternate Current — Reduces unnecessary redstone dust calculations.
Fabric 1.20.1
Same recommended mods as 1.21.1 — Lithium, FerriteCore, ModernFix, Krypton, Structure Layout Optimizer, and Alternate Current.
Fabric 1.19.2
This version retains lighting engine and logic slowdown issues from 1.18, addressed by:
- Lithium, FerriteCore, ModernFix, Krypton, Structure Layout Optimizer, Alternate Current
- Starlight — Greatly speeds up chunk generation and ticking.
- Advancements Debug — Rewrites advancement checking for faster performance and crash prevention.
Fabric 1.18.2
These mods target issues from new world height and terrain generation changes:
- All mods from 1.19.2 list (Lithium, Starlight, ModernFix, FerriteCore, Krypton, Structure Layout Optimizer, Alternate Current, Advancements Debug).
Fabric 1.16.5
This version requires attention to major performance problems:
- Phosphor — Accelerates chunk generation and ticking (replaces Starlight for this version).
- Other mods: Lithium, ModernFix, FerriteCore, Krypton, Structure Layout Optimizer, Alternate Current, Advancements Debug.
Additional Recommendations
Pre-generating chunks is highly recommended for optimal server performance. If you experience ongoing issues, use the Spark profiler to identify specific lag sources.