Fabric is often the go-to modloader for those looking to have the closest experience to vanilla without major gameplay changes. This guide will go over which mods you should install on your server for the best performance on your Fabric server.
Tip
Before proceeding with this guide, please follow our general Performance Guide for server optimizations that apply to all Minecraft servers.
Note
This guide assumes that Fabric is installed on your server already. Please see the following guide for more info.
Additionally, all the mods listed below will need to be uploaded to the mods folder on your server. For more info on how to install mods please refer to the following guide.
Different versions of Fabric have different mods available for performance. Select your version below to see our recommended performance mods for your version of Fabric.
Please note that if a mod is not listed, it may change vanilla behavior or is generally considered broken by the community.
This version of Minecraft mainly focused on a handful of exploit patches and technical changes. These mods focus on similar major gameplay logic issues like 1.20.1.
Lithium: One of the most important mods for performance on a server. Lithium optimizes gameplay logic without changing vanilla mechanics.
FerriteCore: Moderate reduction in RAM usage from patches to block states and locations.
ModernFix: Fixes various bugs and improves startup time and memory footprint.
Krypton: Optimizes the Minecraft network stack to improve connection stability.
Structure Layout Optimizer: Improves generation speed of structures especially with larger modded structures.
Alternate Current: Optimizes redstone dust by reducing unneeded calculations.
This version of Minecraft contains patches to lighting engine issues from previous versions. These mods focus on other major areas for improvement on your server.
Lithium: One of the most important mods for performance on a server. Lithium optimizes gameplay logic without changing vanilla mechanics.
FerriteCore: Moderate reduction in RAM usage from patches to block states and locations.
ModernFix: Fixes various bugs and improves startup time.
Structure Layout Optimizer: Improves generation speed of structures especially with larger modded structures.
Alternate Current: Optimizes redstone dust by reducing unneeded calculations.
This version of Minecraft still has some of the major issues from 1.18 regarding lighting engine issues and other general logic slow-downs. These mods do an excellent job at addressing those issues on your server.
Lithium: One of the most important mods for performance on a server. Lithium optimizes gameplay logic without changing vanilla mechanics.
Starlight: Starlight will greatly speed up chunk generation and ticking.
ModernFix: Fixes various bugs and improves startup time.
FerriteCore: Moderate reduction in RAM usage from patches to block states and locations.
Krypton: Networking and packet delivery optimization.
Structure Layout Optimizer: Improves generation speed of structures especially with larger modded structures.
Alternate Current: Optimizes redstone dust by reducing unneeded calculations.
Advancements Debug: Rewrites advancement checking to be faster and prevent crashes from StackOverflow errors.
This version of Minecraft introduced new world height and terrain generation changes. These mods attempt to address issues with the new changes.
Lithium: One of the most important mods for performance on a server. Lithium optimizes gameplay logic without changing vanilla mechanics.
Starlight: Starlight will greatly speed up chunk generation and ticking.
ModernFix: Fixes various bugs and improves startup time.
FerriteCore: Moderate reduction in RAM usage from patches to block states and locations.
Krypton: Networking and packet delivery optimization.
Structure Layout Optimizer: Improves generation speed of structures especially with larger modded structures.
Alternate Current: Optimizes redstone dust by reducing unneeded calculations.
Advancements Debug: Rewrites advancement checking to be faster and prevent crashes from StackOverflow errors.
This version of Minecraft is generally not very performant compared to other versions. These mods attempt to address issues with the most problematic issues on a server.
Lithium: One of the most important mods for performance on a server. Lithium optimizes gameplay logic without changing vanilla mechanics.
Phosphor: Phosphor will greatly speed up chunk generation and ticking.
ModernFix: Fixes various bugs and improves startup time.
FerriteCore: Moderate reduction in RAM usage from patches to block states and locations.
Krypton: Networking and packet delivery optimization.
Structure Layout Optimizer: Improves generation speed of structures especially with larger modded structures.
Alternate Current: Optimizes redstone dust by reducing unneeded calculations.
Advancements Debug: Rewrites advancement checking to be faster and prevent crashes from StackOverflow errors.
It is highly recommended to pre-generate chunks on your server. Please refer to the following guide for detailed steps on how to do this.
If you have followed this guide and are still experiencing issues, you should analyze your server using the Spark profiler. Check out the following guide from the Spark developers for more information: Spark Guide for instructions on how to track down the specific cause of your lag.
As always, if you get stuck or have any questions, just reach out to a bro on Discord.
