Why Your Images Are Killing Your Core Web Vitals (and How I Fixed It in One Afternoon)

Large images are often the main culprit behind poor Core Web Vitals, especially Largest Contentful Paint (LCP). Using WebP or AVIF can significantly reduce image file sizes, improving performance. WebP has near-universal browser support and is a good baseline, while AVIF offers further compression but requires slower encoding and more processing time. To efficiently convert multiple images, use a bulk image tool like BatchSet.