Performance Tuning

This guide helps you optimize Lumo Optimized for your specific hardware, whether you’re on a low-end laptop or a high-end gaming PC.

Quick Performance Check

1. Launch Minecraft and load a world 2. Press F3 to open debug screen 3. Note your FPS (top-left) 4. Walk around to get an average

FPS	Status
60+	Excellent
40-60	Good
30-40	Playable
Below 30	Needs optimization

RAM Allocation

Finding the Right Amount

Setup	Recommended RAM
Base modpack, no shaders	4 GB
Base modpack with shaders	6 GB
With high-res textures	6-8 GB
Shaders + Voxy LODs	6-8 GB
Maximum quality	8-10 GB

How to Change RAM

Prism Launcher:

1. Right-click instance → Edit 2. Go to Settings → Java 3. Check Memory 4. Set Maximum memory allocation 5. Click Close

Caution

Don’t allocate more than 50% of your total RAM. Leave at least 4GB for your operating system.

JVM Arguments

For better performance, use these JVM arguments:

-XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1

These arguments optimize garbage collection for Minecraft.

Video Settings

Sodium Settings

Access: Options → Video Settings

General

Setting	Low-End	Balanced	High-End
Render Distance	8	12-16	20+
Simulation Distance	8	10	12
Max Framerate	V-Sync or 60	120+	Unlimited
GUI Scale	Auto	Auto	Auto

Quality

Setting	Low-End	Balanced	High-End
Graphics	Fast	Fancy	Fancy
Clouds	OFF	Fast	Fancy
Weather	Fast	Fast	Fancy
Leaves	Fast	Smart	Fancy
Particles	Minimal	Decreased	All
Biome Blend	1x1	3x3	5x5
Entity Distance	75%	100%	150%
Entity Shadows	OFF	ON	ON
Vignette	OFF	ON	ON

Sodium Extra Settings

Access: Options → Video Settings → Extras

Disable animations you don’t need:

• Disable fire animation if not needed
• Disable water animation for slight boost
• Disable unnecessary particles

Performance Tab

Setting	Impact
Fog	Medium
Light Updates	Low
Chunk Updates	Medium
Item Frames	Low

Voxy Tuning

Voxy is up to 10x faster than alternatives while providing excellent LOD rendering.

For Better Performance

Setting	Value
LOD Render Distance	64-128 chunks
Detail Quality	Low
Vertical Quality	Low
Threading	Match CPU cores

For Better Quality

Setting	Value
LOD Render Distance	256+ chunks
Detail Quality	Medium-High
Vertical Quality	Medium
Compression	Lower values

Tip

LODs are generated as you explore. New chunks won’t have LODs until you’ve walked through them.

Shader Optimization

If using shaders, these settings have the biggest impact:

High Impact Settings

1. Shadow Quality - Lower this first
2. Shadow Distance - 2-4 chunks is usually enough
3. Volumetric Fog - Disable for major FPS gain
4. SSAO - Disable for better performance

Medium Impact Settings

1. Reflection Quality
2. Cloud Quality
3. Motion Blur (disable anyway for gameplay)

See the Shaders Guide for detailed shader tuning.

System-Specific Optimization

Laptops

• Keep laptop plugged in
• Set power plan to “High Performance”
• Ensure using dedicated GPU (not integrated)
• Keep vents clear for cooling
• Consider a cooling pad

AMD GPUs

• Update to latest drivers
• Enable AMD Anti-Lag
• Use Radeon Chill for power savings

NVIDIA GPUs

• Update to latest drivers
• Enable “Max Performance” in NVIDIA Control Panel
• Consider NVIDIA Reflex if available

Intel GPUs

• Integrated graphics work best without shaders
• Keep render distance low (8-10)
• Use Potato shader preset if needed

Measuring Performance

Using spark

Run these commands in-game:

/spark profiler start

Play for 30-60 seconds, then:

/spark profiler stop

This generates a report showing what’s using the most resources.

Key Metrics in F3

Metric	Good Value
FPS	60+
E	Under 200 entities
C	Chunk updates low
Mem	Under 80% used

Performance Presets

Potato Mode (Maximum FPS)

• Render Distance: 6-8
• Shaders: OFF
• Clouds: OFF
• Particles: Minimal
• Entity Distance: 50%
• No LODs or low quality LODs

Balanced Mode (Good FPS + Visuals)

• Render Distance: 12
• Shaders: Low/Medium preset
• Clouds: Fast
• Particles: Decreased
• Entity Distance: 100%
• LODs enabled

Quality Mode (Best Visuals)

• Render Distance: 16-20
• Shaders: High/Ultra preset
• Clouds: Fancy
• Particles: All
• Entity Distance: 150%
• High quality LODs