Mind you this guide seems to be for no-code types, or at least for the far less technical, the Achilles heel (when it comes to speed) of WP is the img tag's sizes setting. WP doesn't do it well by default. That is, if the sizes setting is off, the browser will make a suboptimal selection from the srcset.*
Many of the page builders (I've seen) are as bad, or worse. They often don't use sizes + srcset at all. As a result, the same too-wide image is served to smaller view ports.
* Btw, I've developed a fix if you're using Gutenberg. So it is possible. But I'm not sure I'm allowed to share the repo on HN.
Many of the page builders (I've seen) are as bad, or worse. They often don't use sizes + srcset at all. As a result, the same too-wide image is served to smaller view ports.
* Btw, I've developed a fix if you're using Gutenberg. So it is possible. But I'm not sure I'm allowed to share the repo on HN.