Lofesa edited a comment on issue #1876: Image Optimization: Does MPS optimize <source> images? URL: https://github.com/apache/incubator-pagespeed-mod/issues/1876#issuecomment-585950976 Have you enabled pagespeed in this site? Are the `<img src=` rewrited? both, the img element in picture and in noscript. Pagespeed identifies images with `<img src` In the source element, srcset are not true srcset, cause it have only 1 image, so maybe you can try the `AddUrlValuedAttribute source srcset image;` .
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