Optimized Server Modpack

A performance-focused Fabric server modpack designed to improve TPS, reduce lag, optimize memory usage, fix vanilla bugs, and support larger player counts while staying as close to vanilla Minecraft as possible.

Why Download It?

• Less Lag: Improve server tick performance and reduce lag spikes.
• Better Performance: Optimize redstone, entities, AI, networking, and chunk generation.
• Improved Stability: Reduce crashes, memory issues, and common bugs.
• Faster World Loading: Speed up chunk loading and generation with multithreaded optimizations.
• More Players: Improve server scalability and networking performance.
• Vanilla-Friendly: Keep the original Minecraft gameplay experience with minimal changes.

Fixes

Fixes several vanilla Minecraft bugs and common server issues, including underwater swimming, nether portal behavior, packet handling, disconnect errors, and view distance problems. Also includes stability and memory improvements to help prevent crashes, reduce unnecessary resource usage, and provide a smoother multiplayer experience.

What does this implement?

Fixes

• Gameplay: Underwater Swim Fix (MC-220390), MC-258859, NetherPortalFix
• Networking: Packet Fixer, Disconnect Packet Fix
• View Distance: View Distance Fix
• Stability & Memory: ModernFix-mVUS

Performance Optimizations

• Redstone: Alternate Current
• Chunk Generation & Loading: C2ME, NoisiumForked, Structure Layout Optimizer
• Multithreading & Async Processing: Worldthreader, Async, ThreadTweak
• Memory Usage: FerriteCore, ModernFix-mVUS, MemGuard
• Entities & AI: LazyAI, Let Me Despawn, Clumps
• Networking & Player Scaling: Krypton, Very Many Players (VMP)
• Commands: Command Optimiser
• Achievements: Achievements Optimizer
• Server Tick Performance: Lithium, ServerCore, Potatoptimize, TT20 (TPS Fixer), TooBee Optimization
• Lighting: ScalableLux
• Rail Systems: RailOptimization
• World Loading: Ksyxis
• Logging: Async Logger
• Data Processing: LinearReader, Quick Pack
• General Optimizations: I'm Fast, Immersive Optimization, Lomka, Scalable

Networking & Compatibility

• Protocol Compatibility: ViaVersion, ViaFabric
• Packet Handling: Bad Packets, KryptonReno's Fabric Patcher, Packet Fixer
• Chat Privacy: No Chat Reports

Server Tools

• World Pre-generation: Chunky
• Performance Profiling: spark

Supporting Libraries

• Core APIs: Fabric API, Architectury API, Balm, Almanac
• Configuration: Cloth Config API, Forge Config API Port, Resourceful Config
• Additional Dependencies: Cerulean Fork

Other Optimizations

• Entity & Experience Orb Management: Clumps, Let Me Despawn
• Portal Behavior: Disable Portal Checks
• Crash Prevention: Anticrashy
• Rollback Behavior: NoRollback

Requirements

• Minecraft: 1.21.11
• Fabric Loader: 0.19.5
• Java 25 (64-bit JRE) - required by C2ME: for MC 1.21.11, C2ME bundles its natives-math module which needs Java >= 25.

Content

Achievements Optimizer

2.1.2

Almanac

1.6.2

Alternate Current

mc1.21.11-1.9.0

Anticrashy

1.0

Architectury API

19.0.1+fabric

Async

0.2.0+alpha-1.21.11

Async Logger

2.2.2+1.21.11-fabric

bad packets

fabric-0.11.2

Balm

21.11.9.1+fabric-1.21.11

C2ME OpenCL Acceleration Module

0.4.0-alpha.0.27+1.21.11

Cerulean Fork

1.0.1

Chunky

1.4.55

Cloth Config API

21.11.153+fabric

Clumps

29.0.0.1

Command Optimiser

1.0.3

Concurrent Chunk Management Engine (Fabric)

0.4.0-alpha.0.27+1.21.11

Disable Portal Checks

1.0.0

Disconnect Packet Fix

2.0.0-fabric

Fabric API

0.141.6+1.21.11

FerriteCore

8.2.0-fabric

Forge Config API Port

21.11.1

I'm Fast

1.0.3

Immersive Optimization

0.2.0+1.21.11

Krypton

0.2.10

KryptonReno's Fabric Patcher

26.1.2+1.21.9

Ksyxis

1.4.4

LazyAI

1.6.1

Let Me Despawn

1.6.2

LinearReader

1.3.0.1

Lithium

mc1.21.11-0.21.4-fabric

Lomka

mc1.21.11-0.5.4-fabric

MC-258859

1.0+1.21

MemGuard

1.0.2

ModernFix-mVUS

5.26.3-build.1

NetherPortalFix

21.11.2+fabric-1.21.11

No Chat Reports

Fabric-1.21.11-v2.18.0

NoisiumForked

2.8.3+mc1.21.11

NoRollback

2.1

Packet Fixer

3.3.5

Potatoptimize

mc1.21.11-2.1.0

quick pack

fabric-1.5.0+1.21.11

RailOptimization

2.0

Resourceful Config

3.11.3

Scalable

1.0.0

ScalableLux

0.3.0-alpha.0.3+1.21.11

ServerCore

1.5.15+1.21.11

spark

1.10.170-fabric

Structure Layout Optimizer

1.1.4+1.21.11-fabric

ThreadTweak

0.1.8

TooBee Optimization

0.1.1

TT20 (TPS Fixer)

0.8.5

Underwater Swim Fix (MC-220390)

1.0.3

Very Many Players (Fabric)

0.2.0+beta.7.227+1.21.11

ViaFabric

0.4.21+181-1.14-1.21

ViaVersion

5.12.1-SNAPSHOT+1063

View Distance Fix

fabric-1.21.11-1.0.2

Worldthreader

mc1.21.11-2.7.4-fabric