Performance Optimizations

MocaccinoOS Performance Optimizations

MocaccinoOS ships with carefully selected system and network optimizations designed for:

• Desktop responsiveness
• Gaming performance
• Low-latency networking
• Efficient filesystem behavior

Most users do not need to change anything.

• Core optimizations are enabled by default.
• Additional examples are provided for advanced tuning.
• Changes in /usr/lib/sysctl.d/70-mocaccino.conf are overwritten on updates.
• To make permanent adjustments, create:

/etc/sysctl.d/99-custom.conf

Default Optimizations (Already Enabled)

The following settings are applied by default.

Network Performance Tweaks

FQ (Fair Queuing) — Reduced Bufferbloat

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net.core.default_qdisc=fq

Improves packet scheduling and reduces latency spikes under load.

BBR Congestion Control — Low Latency + High Throughput

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net.ipv4.tcp_congestion_control=bbr

BBR improves:

• Latency consistency
• Throughput on modern broadband
• Performance during uploads or downloads

Verify:

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sysctl net.ipv4.tcp_congestion_control

Memory Management Optimizations

Reduce Swap Usage (Desktop Responsiveness)

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vm.swappiness=10

Lower swappiness:

• Reduces background swapping
• Keeps active applications in RAM
• Improves gaming smoothness

Optimize Disk Writeback (Reduce Micro-Stutters)

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vm.dirty_background_ratio=3
vm.dirty_ratio=8
vm.dirty_expire_centisecs=1200
vm.dirty_writeback_centisecs=500

Linux buffers disk writes in memory (“dirty pages”) before flushing them to disk. These settings:

• Start writeback earlier
• Reduce maximum dirty memory
• Smooth disk I/O
• Improve UI responsiveness

Trade-off: slightly reduced peak sequential write throughput.

Reduce VFS Cache Pressure

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vm.vfs_cache_pressure=50

Keeps metadata and directory cache longer, benefiting:

• Gaming workloads
• Development environments
• Large source trees

Filesystem & Process Optimizations

Increase inotify Limits (IDEs, Docker, Game Engines)

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fs.inotify.max_user_watches=524288
fs.inotify.max_user_instances=1024

Prevents file monitoring limits from being reached in large projects.

Customizing TCP Buffer Sizes

MocaccinoOS provides example profiles for different workloads.

Warning: Only one profile should be used at a time.

Low Latency (Gaming, Voice Chat, Video Calls)

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net.core.rmem_max=4194304
net.core.wmem_max=4194304
net.ipv4.tcp_rmem=4096 87380 4194304
net.ipv4.tcp_wmem=4096 16384 4194304

Optimized for latency stability over maximum throughput.

High Bandwidth (File Transfers, Streaming, NAS)

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net.core.rmem_max=16777216
net.core.wmem_max=16777216
net.ipv4.tcp_rmem=4096 87380 16777216
net.ipv4.tcp_wmem=4096 65536 16777216

Apply permanently by copying the profile into:

/etc/sysctl.d/99-custom.conf

Reload settings:

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sudo sysctl --system

Adjusting vm.max_map_count (Advanced Users)

Default:

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vm.max_map_count=65530

Some applications require higher limits:

• Elasticsearch
• Game engines
• AI / ML workloads
• Certain modern games

Example: Increase to 262144

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echo "vm.max_map_count=262144" >> /etc/sysctl.d/99-custom.conf
sudo sysctl --system

Recommended Values:

The game DayZ requires 1048576¹.

How to Apply Changes

After modifying /etc/sysctl.d/99-custom.conf:

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sudo sysctl --system

Verify any setting:

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sysctl <setting>

Example:

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sysctl net.ipv4.tcp_congestion_control

FAQ

What happens if I edit /usr/lib/sysctl.d/70-mocaccino.conf?

⚠ Do NOT edit this file. It will be overwritten during system updates. Always use /etc/sysctl.d/99-custom.conf.

How do I restore default settings?

Delete your custom file:

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sudo rm /etc/sysctl.d/99-custom.conf
sudo sysctl --system

Summary

✔ MocaccinoOS includes performance optimizations by default
✔ Network, memory, and filesystem tuning are preconfigured for desktop use
✔ Advanced users can override settings safely via /etc/sysctl.d/99-custom.conf
✔ Changes in /usr/lib/sysctl.d/ are not persistent across updates

These defaults are designed to balance performance, stability, and responsiveness for modern desktop systems.