Ultimate Guide to CDN Performance Tuning

Performance is the lifeblood of any modern web application. A slow website leads to lost customers and lower search rankings. In this guide, we'll explore advanced techniques to optimize your CDN Engine deployment.

1. Optimize Cache Headers

The most common mistake we see is improper Cache-Control headers. Ensure you are setting long max-age values for static assets like images and CSS.

location ~* \.(jpg|jpeg|png|gif|ico|css|js)$ {
    expires 365d;
    add_header Cache-Control "public, no-transform";
}

2. Enable Compression

Brotli and Gzip compression can significantly reduce the size of your text-based assets. CDN Engine supports both out of the box and automatically selects the optimal algorithm based on the client's `Accept-Encoding` header.

3. Utilize Browser Prefetching

If you know which resources users are likely to access next, use standard browser prefetching. Add `<link rel="prefetch" href="...">` to your HTML head, and browsers will load these resources during idle time, speeding up subsequent page rendering.

4. Monitor Key Metrics

Optimization is an ongoing process. You should closely monitor the following metrics in the CDN Engine dashboard:

• Cache Hit Rate: Aim for over 90%.
• Origin Traffic: Sudden spikes might indicate misconfigured cache rules.
• 5xx Error Rate: Often caused by origin overload; consider increasing cache time or enabling Stale-While-Revalidate.