The sizes of the images in your `srcset` are either too close together or too far apart. If they're too close (e.g., 400w and 420w), you're creating extra images for no real benefit. If they're too far apart (e.g., 400w and 1200w), some users will be forced to download an image that's much larger than they need. A good progression is key.
<img srcset="image-400w.jpg 400w, image-1200w.jpg 1200w">Provide image variants that follow a logical progression, typically 1.5x or 2x the previous size. This provides a good balance of options for the browser.
<img srcset="image-400w.jpg 400w, image-800w.jpg 800w, image-1200w.jpg 1200w">A well-structured `srcset` ensures that the browser can always pick an image that is 'just right' for the user's screen size, optimizing performance without creating unnecessary image files.
This issue can affect your site's search engine rankings and user experience. Addressing it promptly helps ensure optimal performance and visibility in search results.
Black SEO Analyzer automatically checks for this warning during site analysis, along with hundreds of other technical SEO issues.
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