[Resolved] Serving Device Specific Images

[Ian]

I am using GP Pro and GB Pro on this new site. When I run Pagespeed or Webpagetest, I see reports indicating that on mobile, the tests are serving smaller-sized images than on for desktop. Is GP, GB or WordPress core now controlling this? I do have AVIF enabled through Shortpixel, not sure if this contributes to this behaviour. Any thoughts?

[Fernando]

Hi Ian,

By default, WordPress controls the image sizes, not GeneratePress or GenerateBlocks.

In GenerateBlocks, you can set the Image size specific to a view, but the image size is only altered through CSS. The srcset or the image served should still be controlled by WordPress.

Hope this clarifies!

[Ian]

Thank you. Given that WordPress does control this, I guess there is finally a use for the smaller media sets! By the way, when did this start happening? I was not aware of this and always thought you had to rely on a CDN to serve varying sizes. Thanks!

[Fernando]

You’re welcome Ian!

It was added in WordPress 4.4. See here for reference: https://developer.wordpress.org/apis/handbook/responsive-images/

Hope this clarifies!

[Author]

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