Use rel=preload to Improve LCP Score and Load Hero Images Faster
https://addyosmani.comPreload allows you to inform the browser about critical resources you want to load as soon as possible, prior to them being found in HTML. If you are optimizing Largest Contentful Paint (LCP), preload can be a game-changer for boosting download priority of late-discovered Hero images and resources, loaded via JavaScript.
Preload is supported in Chrome, Edge, Safari and Firefox 78+.