Defer loading offscreen images for faster loading of above-the-fold content.
Asynchronously load non-critical CSS files with loadCSS to avoid blocking page rendering.
How to use 'font-display' descriptor for a website that uses Google Fonts.
How to lazy load images for faster load times with no negative SEO impact.
Make sure that images hidden through 'display:none' are not downloaded by the browser.
How to reliably serve WebP images without browser compatibility issues.
Load small background images on smaller screens and large ones on larger screens.