Performance Checks

Performance checks analyze caching configuration, optimization settings, and resource usage. These checks help improve page load times and server efficiency.

Total checks in this category: 10

Caching (5 checks)

System Cache Enabled

Verifies system cache is active.

• Good: Enabled
• Warning: Disabled

Why it matters: System cache stores compiled configuration, significantly reducing load times.

How to enable: System → Global Configuration → System → Cache: ON (Conservative or Progressive)

Impact: Can reduce page generation time by 30-50%

Cache Handler Type

Checks which cache mechanism is used.

• Good: File, Redis, or Memcached
• Warning: Database caching

Why it matters: Database caching is slowest option.

Recommended handlers:

1. Redis - Best for high traffic (requires Redis server)
2. Memcached - Excellent for distributed setups
3. File - Good default for most sites
4. Database - Slowest, avoid if possible

How to change: System → Global Configuration → System → Cache Handler

Page Cache for Guests

Checks if page caching is enabled for non-logged-in users.

• Good: Enabled
• Warning: Disabled

Why it matters: Page caching serves pre-rendered HTML, drastically reducing server load.

How to enable: System → Plugins → System - Page Cache → Enable

Note: Only works for guest (non-logged-in) users

Cache Lifetime Setting

Verifies cache TTL is reasonable.

• Good: 15-60 minutes
• Warning: Below 15 minutes or above 60 minutes

Why it matters:

• Too short: Frequent cache regeneration
• Too long: Stale content displayed

How to configure: System → Global Configuration → System → Cache Time

Cache Directory Writable

Ensures cache directory has proper permissions.

• Good: Writable
• Critical: Not writable

Why it matters: Unwritable cache directory prevents caching from working.

How to fix:

chmod 755 cache/
chown www-data:www-data cache/

Compression & Optimization (4 checks)

Gzip Compression Enabled

Checks if HTTP compression is active.

• Good: Enabled
• Warning: Disabled

Why it matters: Reduces transferred data by 60-80%, dramatically improving load times.

How to enable:

• Joomla: System → Global Configuration → Server → Gzip Page Compression: Yes
• Server level (Apache .htaccess):

  <IfModule mod_deflate.c>
      AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css application/javascript
  </IfModule>

CSS/JS Minification

Verifies asset optimization.

• Good: Minification enabled
• Warning: Disabled

Why it matters: Reduces file sizes and HTTP requests.

How to enable:

• Install optimization extension (e.g., JCH Optimize)
• Use template's built-in optimization
• Configure CDN with automatic minification

Impact: Can reduce CSS/JS size by 50-70%

Image Optimization

Checks if images are optimized.

• Good: Images optimized
• Warning: Unoptimized images detected

Why it matters: Images typically account for 50-90% of page weight.

How to optimize:

1. Use modern formats (WebP, AVIF)
2. Compress before upload (TinyPNG, ImageOptim)
3. Use responsive images (<picture> element)
4. Install image optimization extension
5. Configure lazy loading

Lazy Loading Enabled

Checks if lazy loading is active for images.

• Good: Enabled
• Warning: Disabled

Why it matters: Defers loading off-screen images, improving initial page load.

How to enable:

• Joomla 5: Built-in, enable in article options
• Extensions: Install lazy load plugin
• Template: Use template's lazy load feature

Impact: Can improve Largest Contentful Paint by 20-40%

Media Manager Thumbnails

Checks if thumbnail generation is enabled for the Media Manager.

• Good: Thumbnail generation enabled (shows thumbnail size)
• Warning: Thumbnail generation disabled

Why it matters: By default, the Joomla Media Manager loads full-size images when browsing, which can be extremely slow for sites with large media libraries or high-resolution images. Enabling thumbnail generation creates smaller preview images that load much faster, dramatically improving the Media Manager user experience.

How to enable:

1. Go to System → Plugins
2. Find "Filesystem - Local" plugin
3. Set "Generate Thumbnails" to Yes
4. Configure the thumbnail size (e.g., 200px)

Impact: Significantly faster Media Manager browsing, especially for sites with many images.

Joomla Performance Settings (4 checks)

Debug Plugin Disabled

Verifies debug plugin is off in production.

• Good: Disabled
• Critical: Enabled in production

Why it matters: Debug plugin adds significant overhead and exposes sensitive information.

How to disable: System → Plugins → System - Debug → Disable

Debug Language Disabled

Checks if language debugging is off.

• Good: Disabled
• Warning: Enabled

Why it matters: Language debugging shows translation keys and adds processing overhead.

How to disable: System → Global Configuration → System → Debug Language: No

SEF URLs Enabled

Verifies search engine friendly URLs are active.

• Good: Enabled
• Warning: Disabled

Why it matters: While primarily an SEO feature, SEF URLs also improve caching efficiency.

How to enable: System → Global Configuration → Site → Search Engine Friendly URLs: Yes

URL Rewriting Working

Checks if Apache/Nginx rewriting is configured.

• Good: Working correctly
• Warning: Not configured

Why it matters: Removes "index.php" from URLs, improving caching and SEO.

How to enable:

1. Rename htaccess.txt to .htaccess (Apache)
2. Configure nginx rewrite rules (Nginx)
3. System → Global Configuration → Site → Use URL Rewriting: Yes

Server Performance (3 checks)

PHP OPcache Configured

Verifies PHP opcache is enabled and tuned.

• Good: Enabled with adequate settings
• Warning: Disabled or poorly configured

Why it matters: OPcache caches compiled PHP code, dramatically improving execution speed.

Recommended settings (php.ini):

opcache.enable=1
opcache.memory_consumption=128
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=10000
opcache.revalidate_freq=60

Impact: Can improve PHP execution by 2-3x

Admin Response Time

Monitors backend response time.

• Good: Under 500ms
• Warning: 500ms - 2s
• Critical: Over 2s

Why it matters: Slow admin indicates server or configuration issues.

Common causes:

• Insufficient resources
• Slow database queries
• Too many plugins
• Poor hosting

Peak Memory Usage

Checks PHP memory consumption.

• Good: Under 80% of memory limit
• Warning: 80-95% of limit
• Critical: Over 95% of limit

Why it matters: High memory usage causes crashes and errors.

How to reduce:

1. Increase PHP memory limit
2. Optimize database queries
3. Remove unnecessary plugins
4. Enable object caching

Common Performance Issues & Solutions

Slow Page Load Times

Symptoms: Pages take 3+ seconds to load

Solutions:

1. Enable page caching (biggest impact)
2. Enable Gzip compression
3. Optimize images
4. Enable lazy loading
5. Minify CSS/JS
6. Use CDN
7. Upgrade hosting
8. Optimize database
9. Reduce HTTP requests
10. Enable browser caching

Quick wins (do first):

• Enable system cache
• Enable page cache
• Enable Gzip compression
• Optimize images

Cache Not Working

Symptoms: No performance improvement after enabling cache

Diagnostics:

1. Check cache directory writable
2. Verify plugin order
3. Check for cache-busting headers
4. Review logged-in user detection
5. Check for dynamic content

Solutions:

1. Fix file permissions
2. Clear cache and test
3. Check conflicting plugins
4. Review cache configuration
5. Test with different cache handler

High Memory Usage

Symptoms: "Allowed memory size exhausted" errors

Solutions:

1. Increase PHP memory limit to 256MB+
2. Disable unnecessary plugins
3. Optimize images before upload
4. Review extension resource usage
5. Upgrade hosting plan
6. Enable OPcache
7. Use external caching (Redis/Memcached)

Database Bottlenecks

Symptoms: Slow queries, timeouts

Solutions:

1. Optimize tables regularly
2. Add missing indexes
3. Clean up old data
4. Use external caching
5. Enable query cache
6. Increase database resources
7. Consider read replicas

Performance Optimization Checklist

Immediate Wins

• [ ] Enable system cache (Conservative or Progressive)
• [ ] Enable Gzip compression
• [ ] Disable debug mode and plugins
• [ ] Enable PHP OPcache
• [ ] Optimize and compress images

Caching Strategy

• [ ] Enable page cache for guests
• [ ] Set appropriate cache lifetime (15-30 min)
• [ ] Use Redis or Memcached if available
• [ ] Configure browser caching
• [ ] Enable CDN if high traffic

Asset Optimization

• [ ] Minify CSS and JavaScript
• [ ] Combine files where possible
• [ ] Use modern image formats (WebP)
• [ ] Enable lazy loading
• [ ] Optimize fonts (WOFF2, subset)
• [ ] Reduce HTTP requests

Database Optimization

• [ ] Optimize tables monthly
• [ ] Add indexes for slow queries
• [ ] Clean up expired sessions
• [ ] Archive old content
• [ ] Enable query cache

Server Configuration

• [ ] PHP 8.1+ with opcache
• [ ] Adequate memory (256MB+)
• [ ] SSD storage
• [ ] HTTP/2 or HTTP/3
• [ ] Modern web server (Nginx, LiteSpeed)

Monitoring

• [ ] Track Core Web Vitals
• [ ] Monitor server resources
• [ ] Check slow queries
• [ ] Review error logs
• [ ] Test with tools (GTmetrix, PageSpeed Insights)

Performance Testing Tools

Online Tools

• Google PageSpeed Insights - Core Web Vitals
• GTmetrix - Detailed performance analysis
• WebPageTest - Advanced testing options
• Pingdom - Speed monitoring
• Chrome DevTools - In-browser analysis

What to Monitor

• LCP (Largest Contentful Paint) - Under 2.5s
• FID (First Input Delay) - Under 100ms
• CLS (Cumulative Layout Shift) - Under 0.1
• TTFB (Time to First Byte) - Under 600ms
• Total Page Size - Under 2MB
• HTTP Requests - Under 50

Next Steps

• System Checks - Optimize server configuration
• Database Checks - Tune database performance
• SEO Checks - Improve search engine performance