A slow website kills both SEO rankings and conversions. Even a 1-second delay can significantly impact user behavior.
This guide helps developers identify and fix performance issues.
Common Causes of Slow Websites
- Unoptimized images
- Too many HTTP requests
- Slow backend (PHP, database)
- No caching
- Heavy JavaScript
⚡ Backend Performance Fixes
Optimize PHP Execution
- Enable OPcache
- Reduce unnecessary loops and queries
Database Optimization
- Add indexes
- Avoid N+1 queries
⚡ Frontend Optimization
- Minify CSS/JS
- Use lazy loading:
<img src="image.jpg" loading="lazy">- Reduce unused CSS
Caching Strategies
Symfony:
- HTTP cache
- Reverse proxy (Varnish)
Drupal:
- Page cache
- Dynamic cache
🌍 Use a CDN
A CDN reduces latency by serving content closer to users.
📊 Measure Performance
Track:
- Time to First Byte (TTFB)
- Largest Contentful Paint (LCP)
- Total Blocking Time (TBT)
Internal Linking Tip
Combine performance fixes with a full audit using our Technical SEO Checklist for Developers.
Final Thoughts
Speed optimization is one of the highest ROI improvements you can make. Faster sites rank better and convert more.