Detect whether your site serves images in modern formats (WebP, AVIF) or legacy formats (JPEG, PNG, GIF) that increase page weight.
WebP is 25–34% smaller than JPEG/PNG at the same quality. AVIF is 50% smaller than JPEG. Both are supported in all modern browsers.
Use <picture> elements with WebP/AVIF sources and JPEG fallbacks for maximum compatibility.
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