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Doing a huge overhaul of my website mainly for page load performance, I want to filter the caption shortcode in the_content to load the thumbnail version of the image if wp_is_mobile() returns true. If not, load the size set in the shortcode.

What is the right filter to do so?

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  • and I did disable srcset because they were always loading the regular-sized image, even on mobiles...
    – Lazhar
    Sep 13, 2016 at 10:55

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Maybe you should read this. It explains how to achieve what you are looking for. Be aware of wp_is_mobile() function if you are using any cache system, it would result in some unexpected behavior.

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