Checks if GZIP or Brotli compression is enabled.
This check verifies if your web server is using compression (like Gzip or Brotli) to reduce the file size of your text-based assets (HTML, CSS, JavaScript) before sending them to the browser.
Compression can reduce file sizes by up to 70-80%. This is one of the most effective ways to decrease page load times, as smaller files are downloaded much faster.
Not using compression is a major missed opportunity for performance optimization. It leads to significantly slower load times, especially for users on slower connections.
Run a free audit to see how your site performs on HTML Compression 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.