What Is DNS Prefetch in SEO?
Use Cases
By resolving third-party domains early, DNS Prefetch reduces delays when loading fonts, analytics, or scripts, which directly improves SEO rankings tied to site speed.
Search engines consider performance metrics like First Contentful Paint and Time to Interactive—DNS Prefetch boosts these by minimizing DNS resolution time.
Implement DNS Prefetch for external services like CDNs, ad networks, and chatbots to ensure smoother integration and better UX.
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Frequently Asked Questions
What is the difference between DNS Prefetch and Preconnect?
DNS Prefetch only resolves the domain name, while Preconnect also sets up TCP handshakes and TLS negotiations for faster data transfer.
How do I implement DNS Prefetch in HTML?
Use a link tag like <link rel="dns-prefetch" href="//example.com"> in the head section of your HTML.
Can DNS Prefetch improve SEO rankings?
Yes, by improving page speed and performance metrics, DNS Prefetch can positively impact SEO rankings.
Should I prefetch all third-party domains?
Most modern browsers support DNS Prefetch, but implementations may vary slightly.
Is DNS Prefetch supported in all browsers?
No, it doesn't affect tracking data—it only resolves domains sooner, enhancing speed without altering behavior.
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