Audits preload, preconnect, dns-prefetch, and prefetch hints for correctness.
This check examines your page for resource hints — special HTML tags that tell the browser to prepare for resources it will need soon. It checks for 'preload' (load this critical resource immediately), 'preconnect' (start connecting to this server early), 'dns-prefetch' (resolve this domain name ahead of time), and 'prefetch' (download this resource in the background for future pages). It also verifies they are configured correctly, like having the required 'as' attribute on preload tags.
Resource hints are like giving your browser a heads-up about what's coming next. Instead of discovering resources one by one as it reads your HTML, the browser can start loading critical files earlier. This can shave significant time off your page load speed, making your site feel faster and more responsive to visitors.
Missing or incorrectly configured resource hints represent a missed performance optimization opportunity. While not a direct ranking factor on their own, faster page loads improve user experience and Core Web Vitals scores (like LCP), which do influence your search rankings.
Run a free audit to see how your site performs on Resource Hints and 159 other checks.
Start Free AuditChecks if images use responsive techniques like srcset.
Checks if images have width and height attributes to prevent layout shift.
Checks for JavaScript errors in the browser console. (Note: In-dev check)
Measures the total size of the HTML document.