Adding Custom CDN Hostnames

Last Updated: April 13, 2026 If you’re sure your website uses a performant and reputable CDN, you can add the hostname to GTmetrix tests to avoid triggering the “Use a CDN” audit. How Does GTmetrix CDN Detection Work GTmetrix auto-detects well-known and popular CDNs (e.g., Cloudflare, StackPath, Fastly, etc.) using our custom “Use a …