Performance

Checks for large GIFs that could be converted to video

Lists performance audits that require browser execution

Checks Cache-Control header configuration

Checks for Cumulative Layout Shift prevention

Checks for Gzip or Brotli compression

Identifies chains of dependent resources that delay rendering

Checks for CSS files that exceed recommended size limits

Checks for JavaScript files that exceed recommended size limits

Detects excessive DOM complexity that impacts performance

Detects duplicate JavaScript libraries loaded multiple times

Checks for font loading best practices

Checks for HTTP/2 protocol support

Checks for Interaction to Next Paint optimization

Detects JavaScript resources that return 3XX redirects

Detects JavaScript libraries and checks for known vulnerabilities

Detects lazy loading on likely above-fold images

Checks for Largest Contentful Paint optimization opportunities

Detects ES5 polyfills and legacy JavaScript code

Checks for preconnect hints to critical third-party origins

Checks for render-blocking CSS and JavaScript

Checks for source map availability and configuration

Measures server response time (TTFB)

Checks the total byte weight of the page

Detects unminified CSS that could be optimized

Detects unminified JavaScript that could be optimized