Fabric Server Optimization

Fabric-Server-Optimization.md

Fabric Server Optimization

This has been updated for 26.1 - 26.2, all of the optimization mods mentioned here are compatible with each other and don't affect vanilla behaviour by default.

Mods

Lithium - A mod designed to drastically improve the general performance of Minecraft without breaking things.

VMP - A mod designed to improve general server performance at high playercount.

C2ME - A mod designed to improve the performance of chunk generation, I/O, and loading. This is done by taking advantage of multiple CPU cores in parallel.

ScalableLux - A mod that rewrites the light engine to fix lighting performance and lighting errors.

FerriteCore - A mod that reduces the memory usage of Minecraft in a few different ways.

Krypton - A mod that optimizes the Minecraft networking stack and entity tracker.

Fast Noise - A optimization mod to improve world generation times that maintains vanilla parity, including with any datapacks. It optimizes storing block and biome data into chunks for the duration of worldgen.

RecipeCooldown - A mod that prevents excessive crafting recipe request from the client to lag out the server. (The 26.1 version should work on 26.2 as well.)

Structure Layout Optimizer - A mod that optimizes general Jigsaw structure generation. This mod aims to not change how structures look at all, it only works to try and make structures generate faster and more efficiently.

Disable Portal Checks - Disables unnecessary portal checks that causes lag.

RailOptimization - A simple mod that makes powered/activator rails turn on/off up to 4x faster. Also fixes vital crash.

Other useful mods

Chunky Pregenerator - A mod which pre-generates chunks, quickly and efficiently.

Spark - A performance profiler mod.

View Distance Fix - A mod that fixes the fog when having a higher render distance on the client than on the server. The server tricks the client into thinking that it has the same render distance as the client.

quick pack - A mod that optimizes datapack / resourcepack zip file loading times.

Ledger = A logging mod similar to CoreProtect.

Carpet - A mod for vanilla Minecraft that allows you to take full control of what matters from a technical perspective of the game.

Carpet Extra - A mod that adds extra features to the Carpet mod.

Configurations

server.properties

sync-chunk-writes=false
max-chained-neighbor-updates=10000
simulation-distance should ideally be 9 if you want all types farms to work as intended, but lowering it will improve performance

Java optimization

JRE

Since 26.1 Minecraft requires Java 25 to run. If you don't have Java 25 installed already you can get it from here.

Java start-up flags

Generate a start-up script for your server here.
If you're willing to try out a more modern garbage collection method then check out my set of Java start-up flags.

Hosting

I highly recommend BisectHosting for your server needs. They have 20 server locations, advanced DDoS protection and an user-friendly panel for server management. Use code OBYDUX to get 25% off!

If you're on linux create a start.sh file or start.bat if on Windows and put "java -Xms10G -Xmx10G (insert those flags) -jar fabric-server-launch.jar" inside of it. Replace 10G with the amount of RAM in GB you would like your server to use (don't go above 12GB unless you need to)

If you're on linux create a start.sh file or start.bat if on Windows and put "java -Xms10G -Xmx10G (insert those flags) -jar fabric-server-launch.jar" inside of it. Replace 10G with the amount of RAM in GB you would like your server to use (don't go above 12GB unless you need to)

Ty

whitch one of thees should i download

and am i downloading the correct version

and am i downloading the correct version

I would suggest using Adoptium's version of Java : https://adoptium.net/temurin/releases/
Also yes, 17 is correct

and am i downloading the correct version

I would suggest using Adoptium's version of Java : https://adoptium.net/temurin/releases/ Also yes, 17 is correct

I want the graalvm i just want to know whitc one of those should i use the JDK or native image

and am i downloading the correct version

I would suggest using Adoptium's version of Java : https://adoptium.net/temurin/releases/ Also yes, 17 is correct

I want the graalvm i just want to know whitc one of those should i use the JDK or native image

Can't guarantee that mods will work correctly on Graal since I faced some issues before but you need the JDK if you want to be able to run the server

and am i downloading the correct version

I would suggest using Adoptium's version of Java : https://adoptium.net/temurin/releases/ Also yes, 17 is correct

I want the graalvm i just want to know whitc one of those should i use the JDK or native image

Can't guarantee that mods will work correctly on Graal since I faced some issues before but you need the JDK if you want to be able to run the server

So i need the jdk edition if it dosent work then 💀

I cant get the ee version

Should i use ce

Should i use ce

You don't need Graal

Should i use ce

You don't need Graal

Ok ill use adoptium

The JVM args specified in the guide make my RAM usage on pterodactyl max out, but not in game (using spark). I am very inexperienced in JVM args, so I have absolutely no idea what is wrong lol.

The JVM args specified in the guide make my RAM usage on pterodactyl max out, but not in game (using spark). I am very inexperienced in JVM args, so I have absolutely no idea what is wrong lol.

Because the minimum value is the same as the maximum value

What i

and here mine tuned for low end processors and small RAM (adapt the number 2 in first three flags to your cores count)

Note:

1. This only works with OpenJ9 VM
2. It creates 2 GB shared class cache (this can hugely improve startup on weaker processor by letting OpenJ9 AOT compile methods and saves information about various stuff not just class data)

-Xgcmaxthreads2 -XX:ParallelGCThreads=2 -XcompilationThreads2 -Xgcpolicy:gencon -XX:+IdleTuningGcOnIdle -XX:+UseAggressiveHeapShrink -XX:-OmitStackTraceInFastThrow -XX:+UseFastAccessorMethods -XX:+OptimizeStringConcat -Xshareclasses:allowClasspaths -Xaot -XX:+UseCompressedOops -XX:ObjectAlignmentInBytes=256 -Xshareclasses -Xscmx2000M -XX:SharedCacheHardLimit=2000M  -Xtune:virtualized -XX:+TieredCompilation -Dlog4j2.formatMsgNoLookups=true -XX:-DisableExplicitGC -XX:InitiatingHeapOccupancyPercent=60 -XX:+UnlockExperimentalVMOptions -XX:MaxGCPauseMillis=6 -XX:-ParallelRefProcEnabled -XX:+UseTLAB -XX:ReservedCodeCacheSize=70M -XX:+AdaptiveGCThreading -XX:+UseStringDeduplication -XX:-PortableShareCache -XX:+UseGCStartupHints -XX:+ShareUnsafeClasses -XX:+ShareAnonymousClasses -XX:ShareClassesEnableBCI -Xshareclasses:cacheRetransformed -Xshareclasses:enableBCI 

How can I use this? And what is it? I'm new to servers.

Help: when I launch my server with Fabric 1.16.5 w lithium(0.6.6) & krypton(0.1.2) & ferritecore(2.1.1): ferritecore crashes ! I removed it, and it seems that the launch.sh doesn't have the permission to read/write the params file .?

@lemmings189 try it:
chown 1000:1000 ../<serverPath>/ -R
If you are using a docker try to set argument :z to volumen to shared it

stop this comment section drama already

because im fucking gone

a small suggestion, dont you can lock conversation thread (issue/pr/etc) in github? if you want to forget this?