Felix Arntz explains how it was…

Felix Arntz explains how it was recently discovered that the current WordPress core implementation might regress the Largest Contentful Paint (LCP) metricΒ  β€œwhen hero images above the fold are being lazy-loaded.”

Felix notes the adjustments for WordPress 5.9 will likely have just the very first content image or content iframe not be lazy-loaded. (Featured images are also being considered.)

This will become the default and should result in better LCP performance for WordPress β€œout of the box” while leaving more granular control to theme authors so they can decide which elements should be lazy-loaded.