Almost no images use modern formats

Modern image formats like WebP and AVIF deliver the same visual quality as JPEG and PNG but at 25 to 50 percent smaller file sizes, meaning pages load faster using less data. When nearly all images are in older formats, your pages are heavier than they need to be, slowing load times for all visitors — especially on mobile — and reducing your chances of ranking well in Google. Convert your images to WebP or AVIF format. Most image editing tools and website platforms support this, and many hosting providers can do it automatically.