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Advanced guides
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Remote Networks
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Notifications Guide
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Name Resolution
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Authelia
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Performance
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Performance
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Common Causes of Slowness
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Database and Log File Size
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<a href="#maintenance-plugins" class="md-nav__link">
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Maintenance Plugins
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<nav class="md-nav" aria-label="Maintenance Plugins">
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<a href="#1-database-cleanup-dbclnp" class="md-nav__link">
<span class="md-ellipsis">
1. Database Cleanup (DBCLNP)
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#2-maintenance-maint" class="md-nav__link">
<span class="md-ellipsis">
2. Maintenance (MAINT)
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Scan Frequency and Coverage
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Optimizations
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Storing Temporary Files in Memory
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Reverse DNS
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<a href="../REVERSE_PROXY/" class="md-nav__link">
<span class="md-ellipsis">
Reverse Proxy
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<a href="../WEBHOOK_N8N/" class="md-nav__link">
<span class="md-ellipsis">
Webhooks (n8n)
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<a href="../WORKFLOWS/" class="md-nav__link">
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Workflows
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Workflow Examples
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Docker Swarm
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Common issues
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Random MAC
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Incorrect Offline Detection
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Device guides
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Device guides
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Editing Devices
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Editing Devices
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Management
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Bulk Editing
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Custom Properties
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Device Display Settings
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Session Info
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Icons and Topology
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Icons and Topology
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<a href="../ICONS/" class="md-nav__link">
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Icons
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<a href="../NETWORK_TREE/" class="md-nav__link">
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Network Topology
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Troubleshooting
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Troubleshooting
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General Tips
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Common issues
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Inspecting Logs
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API Server Issues
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<a href="../DEBUG_INVALID_JSON/" class="md-nav__link">
<span class="md-ellipsis">
Invalid JSON Issues
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<a href="../DEBUG_PHP/" class="md-nav__link">
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PHP Issues
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Plugin Issues
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Web UI Port Issues
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Workflows Issues
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Development
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Plugin and app development
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Plugin and app development
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Environment Setup
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Builds
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Devcontainer
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Custom Plugins
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<a href="../PLUGINS_DEV_CONFIG/" class="md-nav__link">
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Plugin Config
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Frontend Development
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Database
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Settings
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Versions
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Icon and Type guessing
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API
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API
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<a href="../API/" class="md-nav__link">
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Overview
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<a href="../API_DEVICES/" class="md-nav__link">
<span class="md-ellipsis">
Devices Collection
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<span class="md-ellipsis">
Device
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Sessions
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Settings
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Events
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Messaging in-app
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<a href="../API_METRICS/" class="md-nav__link">
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Metrics
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<span class="md-ellipsis">
Net Tools
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Online History
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Sync
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GraphQL
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DB query
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Tests
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SUPERSEDED OLD API Overview
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Integrations
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Integrations
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Webhook Secret
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Helper scripts
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Table of contents
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Common Causes of Slowness
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Database and Log File Size
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Maintenance Plugins
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1. Database Cleanup (DBCLNP)
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2. Maintenance (MAINT)
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Scan Frequency and Coverage
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Optimizations
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Storing Temporary Files in Memory
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<h1 id="performance-optimization-guide">Performance Optimization Guide</h1>
<p>There are several ways to improve the application's performance. The application has been tested on a range of devices, from Raspberry Pi 4 units to NAS and NUC systems. If you are running the application on a lower-end device, fine-tuning the performance settings can significantly improve the user experience.</p>
<h2 id="common-causes-of-slowness">Common Causes of Slowness</h2>
<p>Performance issues are usually caused by:</p>
<ul>
<li><strong>Incorrect settings</strong> – The app may restart unexpectedly. Check <code>app.log</code> under <strong>Maintenance → Logs</strong> for details.</li>
<li><strong>Too many background processes</strong> – Disable unnecessary scanners.</li>
<li><strong>Long scan durations</strong> – Limit the number of scanned devices.</li>
<li><strong>Excessive disk operations</strong> – Optimize scanning and logging settings.</li>
<li><strong>Maintenance plugin failures</strong> – If cleanup tasks fail, performance can degrade over time.</li>
</ul>
<p>The application performs regular maintenance and database cleanup. If these tasks are failing, you will see slowdowns.</p>
<h3 id="database-and-log-file-size">Database and Log File Size</h3>
<p>A large database or oversized log files can impact performance. You can check database and table sizes on the <strong>Maintenance</strong> page.</p>
<p><img alt="DB size check" src="../img/PERFORMANCE/db_size_check.png" /></p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<ul>
<li>For <strong>~100 devices</strong>, the database should be around <strong>50 MB</strong>.</li>
<li>No table should exceed <strong>10,000 rows</strong> in a healthy system.</li>
<li>Actual values vary based on network activity and plugin settings.</li>
</ul>
</div>
<hr />
<h2 id="maintenance-plugins">Maintenance Plugins</h2>
<p>Two plugins help maintain the system’s performance:</p>
<h3 id="1-database-cleanup-dbclnp"><strong>1. Database Cleanup (DBCLNP)</strong></h3>
<ul>
<li>Handles database maintenance and cleanup.</li>
<li>See the <a href="/front/plugins/db_cleanup/README.md">DB Cleanup Plugin Docs</a>.</li>
<li>Ensure it’s not failing by checking logs.</li>
<li>Adjust the schedule (<code>DBCLNP_RUN_SCHD</code>) and timeout (<code>DBCLNP_RUN_TIMEOUT</code>) if necessary.</li>
</ul>
<h3 id="2-maintenance-maint"><strong>2. Maintenance (MAINT)</strong></h3>
<ul>
<li>Cleans logs and performs general maintenance tasks.</li>
<li>See the <a href="/front/plugins/maintenance/README.md">Maintenance Plugin Docs</a>.</li>
<li>Verify proper operation via logs.</li>
<li>Adjust the schedule (<code>MAINT_RUN_SCHD</code>) and timeout (<code>MAINT_RUN_TIMEOUT</code>) if needed.</li>
</ul>
<hr />
<h2 id="scan-frequency-and-coverage">Scan Frequency and Coverage</h2>
<p>Frequent scans increase resource usage, network traffic, and database read/write cycles.</p>
<h3 id="optimizations"><strong>Optimizations</strong></h3>
<ul>
<li><strong>Increase scan intervals</strong> (<code>&lt;PLUGIN&gt;_RUN_SCHD</code>) on busy networks or low-end hardware.</li>
<li><strong>Increase timeouts</strong> (<code>&lt;PLUGIN&gt;_RUN_TIMEOUT</code>) to avoid plugin failures.</li>
<li><strong>Reduce subnet size</strong> – e.g., use <code>/24</code> instead of <code>/16</code> to reduce scan load.</li>
</ul>
<p>Some plugins also include options to limit which devices are scanned. If certain plugins consistently run long, consider narrowing their scope.</p>
<p>For example, the <strong>ICMP plugin</strong> allows scanning only IPs that match a specific regular expression.</p>
<hr />
<h2 id="storing-temporary-files-in-memory">Storing Temporary Files in Memory</h2>
<p>On devices with slower I/O, you can improve performance by storing temporary files (and optionally the database) in memory using <code>tmpfs</code>.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Storing the <strong>database</strong> in <code>tmpfs</code> is generally discouraged. Use this only if device data and historical records are not required to persist. If needed, you can pair this setup with the <code>SYNC</code> plugin to store important persistent data on another node. See the <a href="../PLUGINS/">Plugins docs</a> for details.</p>
</div>
<p>Using <code>tmpfs</code> reduces disk writes and speeds up I/O, but <strong>all data stored in memory will be lost on restart</strong>.</p>
<p>Below is an optimized <code>docker-compose.yml</code> snippet using non-persistent logs, API data, and DB:</p>
<pre><code class="language-yaml">services:
netalertx:
container_name: netalertx
# Use this line for the stable release
image: &quot;ghcr.io/jokob-sk/netalertx:latest&quot;
# Or use this line for the latest development build
# image: &quot;ghcr.io/jokob-sk/netalertx-dev:latest&quot;
network_mode: &quot;host&quot;
restart: unless-stopped
cap_drop: # Drop all capabilities for enhanced security
- ALL
cap_add: # Re-add necessary capabilities
- NET_RAW
- NET_ADMIN
- NET_BIND_SERVICE
volumes:
- ${APP_FOLDER}/netalertx/config:/data/config
- /etc/localtime:/etc/localtime:ro
tmpfs:
# All writable runtime state resides under /tmp; comment out to persist logs between restarts
- &quot;/tmp:uid=20211,gid=20211,mode=1700,rw,noexec,nosuid,nodev,async,noatime,nodiratime&quot;
- &quot;/data/db:uid=20211,gid=20211,mode=1700&quot; # ⚠ You will lose historical data on restart
environment:
- PORT=${PORT}
- APP_CONF_OVERRIDE=${APP_CONF_OVERRIDE}
</code></pre>
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