WordPress Performance Optimization Cheat Sheet

1. Hosting & Server

Choose Quality Hosting

• Avoid shared hosting for high-traffic sites
• Managed WordPress hosting recommended (WP Engine, Kinsta, Flywheel)
• VPS/Cloud for flexibility (DigitalOcean, Linode, Vultr)
• Ensure PHP 8.1+ (latest stable version)

Server Configuration

# .htaccess - Enable Gzip Compression
<IfModule mod_deflate.c>
  AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javascript application/javascript application/json
</IfModule>

# Browser Caching
<IfModule mod_expires.c>
  ExpiresActive On
  ExpiresByType image/jpg "access plus 1 year"
  ExpiresByType image/jpeg "access plus 1 year"
  ExpiresByType image/gif "access plus 1 year"
  ExpiresByType image/png "access plus 1 year"
  ExpiresByType image/webp "access plus 1 year"
  ExpiresByType text/css "access plus 1 month"
  ExpiresByType application/javascript "access plus 1 month"
  ExpiresByType application/pdf "access plus 1 month"
</IfModule>

2. Caching Strategy

Page Caching (Choose One)

• WP Rocket (Premium, easiest)
• W3 Total Cache (Free, powerful)
• WP Super Cache (Free, simple)
• LiteSpeed Cache (Free, if on LiteSpeed server)

Object Caching

// Install Redis or Memcached
// wp-config.php
define('WP_CACHE_KEY_SALT', 'yoursite.com');

Plugins: Redis Object Cache, Memcached Object Cache

3. Database Optimization

Regular Cleanup

-- Delete post revisions
DELETE FROM wp_posts WHERE post_type = 'revision';

-- Delete trash
DELETE FROM wp_posts WHERE post_status = 'trash';

-- Delete spam comments
DELETE FROM wp_comments WHERE comment_approved = 'spam';

-- Optimize tables
OPTIMIZE TABLE wp_posts, wp_postmeta, wp_options;

Plugins: WP-Optimize, Advanced Database Cleaner

wp-config.php Settings

// Limit post revisions
define('WP_POST_REVISIONS', 3);

// Autosave interval (default 60s)
define('AUTOSAVE_INTERVAL', 300);

// Empty trash automatically
define('EMPTY_TRASH_DAYS', 7);

4. Image Optimization

Compress Images Before Upload

• Use TinyPNG, ImageOptim, or Squoosh
• Target: <100KB for most images

Lazy Loading

<!-- Native lazy loading (WordPress 5.5+) -->
<img src="image.jpg" loading="lazy" alt="Description">

Modern Formats

• Convert to WebP (90% smaller than JPEG)
• Use AVIF for even better compression

Plugins: Imagify, ShortPixel, EWWW Image Optimizer, Smush

5. CSS & JavaScript

Minify & Combine

Plugins: WP Rocket, Autoptimize, Asset CleanUp

Defer/Async JavaScript

<!-- Defer non-critical JS -->
<script src="script.js" defer></script>

<!-- Async for independent scripts -->
<script src="analytics.js" async></script>

Remove Unused CSS/JS

• Asset CleanUp (disable scripts per page)
• Remove jQuery if not needed
• Eliminate render-blocking resources

6. CDN (Content Delivery Network)

Popular CDNs

• Cloudflare (Free tier available)
• StackPath
• BunnyCDN (affordable)
• KeyCDN

Benefits

• Faster global delivery
• Reduced server load
• DDoS protection (Cloudflare)

7. Plugin & Theme Optimization

Audit Plugins

• Keep only essential plugins (aim for <20)
• Deactivate and delete unused plugins
• Avoid plugin bloat

Check plugin performance: Query Monitor, P3 Plugin Profiler

Choose Lightweight Themes

Recommended: GeneratePress, Astra, Kadence

Disable Unnecessary Features

// functions.php

// Disable emojis
remove_action('wp_head', 'print_emoji_detection_script', 7);
remove_action('wp_print_styles', 'print_emoji_styles');

// Disable embeds
function disable_embeds() {
    wp_deregister_script('wp-embed');
}
add_action('wp_footer', 'disable_embeds');

// Remove query strings
function remove_query_strings() {
    if(!is_admin()) {
        add_filter('script_loader_src', 'remove_query_strings_split', 15);
        add_filter('style_loader_src', 'remove_query_strings_split', 15);
    }
}
function remove_query_strings_split($src){
    $output = preg_split("/(&ver|\?ver)/", $src);
    return $output[0];
}
add_action('init', 'remove_query_strings');

8. Advanced Optimizations

Preload/Prefetch

<!-- Preload critical resources -->
<link rel="preload" href="font.woff2" as="font" type="font/woff2" crossorigin>

<!-- DNS prefetch for external domains -->
<link rel="dns-prefetch" href="//fonts.googleapis.com">

Optimize Fonts

/* Use font-display swap */
@font-face {
  font-family: 'CustomFont';
  src: url('font.woff2') format('woff2');
  font-display: swap;
}

• Limit font weights/styles
• Self-host Google Fonts
• Use system fonts when possible

Heartbeat API Control

// wp-config.php - Reduce Heartbeat frequency
define('WP_HEARTBEAT_INTERVAL', 60);

9. Mobile Optimization

Responsive Design

• Use mobile-first CSS
• Test on real devices
• Optimize tap targets (44×44px minimum)

Reduce Mobile Payload

• Serve smaller images to mobile
• Conditionally load resources
• Simplify mobile design

10. Monitoring & Testing

Speed Testing Tools

• Google PageSpeed Insights
• GTmetrix
• WebPageTest
• Pingdom

Key Metrics (Core Web Vitals)

• LCP (Largest Contentful Paint): <2.5s
• FID (First Input Delay): <100ms
• CLS (Cumulative Layout Shift): <0.1

✅ Quick Wins Checklist

Essential wp-config.php Tweaks

// Increase memory limit
define('WP_MEMORY_LIMIT', '256M');

// Limit post revisions
define('WP_POST_REVISIONS', 3);

// Disable file editing in admin
define('DISALLOW_FILE_EDIT', true);

// Enable debug mode (disable in production)
define('WP_DEBUG', false);

// Database optimization
define('WP_CACHE', true);

❌ Common Performance Killers

🎯 Target Goal

<2 second page load time | 90+ PageSpeed score

Performance is ongoing – test regularly and optimize iteratively!