Umut

<p>This plugin is a “must-have” for websites using themes that display the Featured Image automatically at the top in single post pages.</p>
<h3>Features</h3>
<ul>
<li>
<p>Automatically preloads the Featured Image in posts to improve PageSpeed scores.</p>
</li>
<li>
<p>Customizable options to choose the image size to preload.</p>
</li>
<li>
<p>Option to enable or disable the preload functionality.</p>
</li>
</ul>
<h3>License</h3>
<p>GPL2</p>


Preload Featured Image

Preload Featured Image automatically in posts to increase the PageSpeed Score.

Ravikumar Patel

webbymonks

<p>Preload images to get faster page loading experience. Preload Images plugin supports unlimited image urls, good for photo galleries and other image-heavy sites where you want to deliver the photos as seamlessly as possible.</p>


Preload Images

I found myself needing to pre-load some images and started to figure out how to do it by hand when I thought "If you have a need in WordPress, there's probably a plugin for it." So I went hunting and found this plugin.

Gutenberg made it a little hard to see the meta box on Pages at first, but I found it.

I REALLY like that you can preload per page/post, or have them global.  Nicely done.

Does an excellent job

Similar to DNS prefetching, image preloading/prefetching with JavaScript to get faster page loading experience.

Preload Featured Image vs Preload Images