Performance Optimization

SLAED CMS is designed with a focus on high performance and efficient resource utilization. However, to achieve maximum site speed, you need to properly configure the system and server environment.

Performance Analysis
PHP Optimization
Database Optimization
Caching
Web Server Optimization
Image Optimization
CDN Integration
Lazy Loading
Performance Monitoring
Scaling
Optimization Recommendations

Performance Analysis

Built-in Tools

SLAED CMS provides built-in tools for performance analysis:

System Information - systeminfo.php - System characteristics, PHP/MySQL versions, resource usage
Compatibility Check - check_compat.php - System requirements analysis
File Write Test - test_write.php - File permissions and write speed test

External Tools

For more detailed analysis, you can use:

Google PageSpeed Insights - Web page performance analysis
GTmetrix - Comprehensive speed analysis
Pingdom Tools - Site load time testing
WebPageTest - Detailed performance analysis

PHP Optimization

php.ini Settings

For optimal SLAED CMS performance, use the following PHP configuration:

; Memory
memory_limit = 256M

; Execution time
max_execution_time = 300
max_input_time = 300

; File uploads
upload_max_filesize = 32M
post_max_size = 32M
max_file_uploads = 20

; OPcache (essential for performance)
opcache.enable = 1
opcache.memory_consumption = 128
opcache.max_accelerated_files = 4000
opcache.revalidate_freq = 60
opcache.save_comments = 0
opcache.fast_shutdown = 1

; Sessions
session.gc_maxlifetime = 86400
session.cookie_lifetime = 0
session.cookie_secure = 1
session.cookie_httponly = 1
session.cookie_samesite = "Strict"

; Security
expose_php = Off
display_errors = Off
log_errors = On

PHP Extensions

Required extensions for performance:

OPcache - PHP bytecode caching
mysqli - Optimized MySQL access
gd - Image processing
zip - Archive handling

Recommended extensions:

APCu - In-memory user cache
Redis - Distributed cache
Memcached - High-performance cache

Database Optimization

MySQL/MariaDB Settings

Recommended settings for my.cnf:

[mysqld]
# Buffers
innodb_buffer_pool_size = 256M
innodb_log_buffer_size = 16M
key_buffer_size = 64M

# Logs
innodb_log_file_size = 64M
innodb_flush_log_at_trx_commit = 2

# Query cache
query_cache_type = 1
query_cache_size = 32M
query_cache_limit = 2M

# Connections
max_connections = 100
max_connect_errors = 10

# Optimization
skip-name-resolve
table_open_cache = 2000
table_definition_cache = 2000

Table Optimization

Regular table optimization:

-- Optimize all SLAED CMS tables
OPTIMIZE TABLE sl_users, sl_modules, sl_config, sl_blocks, sl_categories;

Caching

Built-in SLAED CMS Caching

SLAED CMS provides a multi-level caching system:

Page Caching - Full HTML page caching with configurable lifetime
CSS/JavaScript Caching - File merging and minification
Block Caching - Individual block caching with separate lifetimes

Cache Configuration

In config/config_core.php:

$conf = array(
    // Block caching
    'cache_b' => '1',           // Enable block caching
    'cache_d' => '7',           // Cache days
    'cache_t' => '3600',        // Cache lifetime (seconds)
    
    // CSS/JS caching
    'cache_css' => '1',         // CSS caching
    'cache_script' => '1',      // JavaScript caching
    
    // Compression
    'css_c' => '1',             // CSS compression
    'script_c' => '1',          // JavaScript compression
    'html_compress' => '1',     // HTML compression
);

External Caching Systems

Redis

// Redis connection
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

// Caching functions
function cache_get_redis($key) {
    global $redis;
    return $redis->get($key);
}

function cache_set_redis($key, $data, $ttl = 3600) {
    global $redis;
    return $redis->setex($key, $ttl, $data);
}

Memcached

// Memcached connection
$memcached = new Memcached();
$memcached->addServer('localhost', 11211);

// Caching functions
function cache_get_memcached($key) {
    global $memcached;
    return $memcached->get($key);
}

function cache_set_memcached($key, $data, $ttl = 3600) {
    global $memcached;
    return $memcached->set($key, $data, $ttl);
}

Web Server Optimization

Apache

Optimize .htaccess:

# Static file caching
<IfModule mod_expires.c>
    ExpiresActive On
    ExpiresByType text/css "access plus 1 month"
    ExpiresByType application/javascript "access plus 1 month"
    ExpiresByType image/png "access plus 1 month"
    ExpiresByType image/jpg "access plus 1 month"
    ExpiresByType image/jpeg "access plus 1 month"
    ExpiresByType image/gif "access plus 1 month"
    ExpiresByType image/svg+xml "access plus 1 month"
</IfModule>

# Compression
<IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE text/plain
    AddOutputFilterByType DEFLATE text/html
    AddOutputFilterByType DEFLATE text/xml
    AddOutputFilterByType DEFLATE text/css
    AddOutputFilterByType DEFLATE application/xml
    AddOutputFilterByType DEFLATE application/xhtml+xml
    AddOutputFilterByType DEFLATE application/rss+xml
    AddOutputFilterByType DEFLATE application/javascript
    AddOutputFilterByType DEFLATE application/x-javascript
</IfModule>

# ETags
<IfModule mod_headers.c>
    Header unset ETag
    FileETag None
</IfModule>

Nginx

Optimize Nginx configuration:

server {
    # Static file caching
    location ~* \.(css|js|png|jpg|jpeg|gif|ico|svg)$ {
        expires 1M;
        add_header Cache-Control "public, immutable";
        add_header Vary "Accept-Encoding";
    }
    
    # Compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/javascript
        application/xml+rss
        application/json;
}

Image Optimization

Image Formats

Recommended formats:

WebP - Modern format with better compression
AVIF - Next generation image formats
JPEG - For photographs
PNG - For images with transparency

Automatic Optimization

SLAED CMS supports automatic image optimization:

// Image optimization on upload
function optimize_image($source, $destination, $quality = 85) {
    $info = getimagesize($source);
    
    switch ($info['mime']) {
        case 'image/jpeg':
            $image = imagecreatefromjpeg($source);
            imagejpeg($image, $destination, $quality);
            break;
        case 'image/png':
            $image = imagecreatefrompng($source);
            imagepng($image, $destination, floor($quality/10)-1);
            break;
        case 'image/webp':
            $image = imagecreatefromwebp($source);
            imagewebp($image, $destination, $quality);
            break;
    }
    
    imagedestroy($image);
}

CDN (Content Delivery Network)

CDN Integration

To use CDN, configure these parameters:

Static Files

// In configuration
$conf['cdn_url'] = 'https://cdn.yoursite.com';

Resource Connection

<link rel="stylesheet" href="https://cdn.yoursite.com/templates/default/theme.css">
<script src="https://cdn.yoursite.com/plugins/jquery/jquery.min.js"></script>

Lazy Loading

Lazy Loading for Images

Implementing lazy loading:

<!-- Images with lazy loading -->
<img data-src="image.jpg" alt="Description" class="lazy" loading="lazy">

// JavaScript for lazy loading
document.addEventListener("DOMContentLoaded", function() {
    const lazyImages = [].slice.call(document.querySelectorAll("img.lazy"));
    
    if ("IntersectionObserver" in window) {
        let lazyImageObserver = new IntersectionObserver(function(entries, observer) {
            entries.forEach(function(entry) {
                if (entry.isIntersecting) {
                    let lazyImage = entry.target;
                    lazyImage.src = lazyImage.dataset.src;
                    lazyImage.classList.remove("lazy");
                    lazyImageObserver.unobserve(lazyImage);
                }
            });
        });
        
        lazyImages.forEach(function(lazyImage) {
            lazyImageObserver.observe(lazyImage);
        });
    }
});

Performance Monitoring

Performance Logging

Enable execution time logging:

// In configuration
$conf['log_performance'] = 1;
$conf['performance_threshold'] = 1000; // ms

// Logging slow queries
function log_slow_query($query, $time) {
    global $conf;
    if ($time > $conf['performance_threshold']) {
        error_log("Slow query: {$query} ({$time}ms)", 3, LOGS_DIR.'/performance.log');
    }
}

Alerting

Configure performance issue notifications:

// Send alerts
function send_performance_alert($issue, $details) {
    $subject = "Performance Alert: {$issue}";
    $message = "Performance issue detected:\n\n{$details}";
    mail(ADMIN_EMAIL, $subject, $message);
}

Scaling

Horizontal Scaling

For high-traffic sites:

Load Balancing

upstream slaed_backend {
    server 192.168.1.10:8080;
    server 192.168.1.11:8080;
    server 192.168.1.12:8080;
}

Database Splitting - Master-slave replication, table sharding

Vertical Scaling

Increase server resources:

More powerful processor
More RAM
SSD storage
Dedicated server

Optimization Recommendations

Checklist

Enable and configure OPcache
Optimize PHP settings
Configure MySQL caching
Enable SLAED CMS caching
Optimize images
Use CDN for static files
Enable Gzip compression
Configure browser caching
Implement lazy loading
Conduct load testing

Regular Maintenance

Weekly

Database table optimization
Log cleanup
Cache verification

Monthly

Performance analysis
PHP and MySQL updates
Backup

Quarterly

Code audit
Security check
Extension updates

By following these recommendations, you can achieve maximum performance for your SLAED CMS site and ensure an excellent user experience.