AspieSoft

Easily lazy load another page simply by adding a shortcode with its url.
The 2nd page wont load until the user scrolls to the bottom, than an ajax request is sent to get the page content. 
This can help speed up large pages on your site, by not loading the stuff users don’t see until they scroll down closer to the bottom.

AspieSoft Ajax Load Page

Easily lazy load another page simply by adding a shortcode with its url.

johnguaz

Add loading screens to your beautiful WordPress websites
FEATURES & OPTIONS
<ul>
<li>Different Loader types in css3 animation where you can customize the size and color</li>
<li>Customizable background colors</li>
<li>Option to add your logo in the loading screen</li>
<li>Option to add text and exit button for your loading screen</li>
<li>Option to choose which published pages and public post types to show the loading screen</li>
<li>Option to add entrance and exit animation for your loading screen</li>
</ul>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/sLWammgBc8E?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

Ipp Simple Loading

Add loading screens to your beautiful Wordpress websites

AspieSoft Ajax Load Page vs Ipp Simple Loading