Billy Wilcosky

Frontend Loader is a WordPress plugin designed to add a sleek, minimal loading spinner to your website, offering an enhanced user experience reminiscent of native applications. It intelligently detects ajax requests, link clicks, and page loads to activate, excluding WordPress heartbeat actions to avoid unnecessary activations. A settings page provides a way to tell the plugin to ignore certain types of clicks and/or ajax requests based on CSS selectors (Classes or IDs).
This plugin is brought to you by SkyWolf, Billy Wilcosky, and generous donators like you! If this plugin enhances your website, consider supporting development: https://www.buymeacoffee.com/billyw 
Suggested donation is $5.
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Frontend Loader aims to provide an app-like loading experience, enhancing your site’s feel and responsiveness. We appreciate your support and feedback to continually improve this plugin.

Frontend Loader

A minimal loading spinner for WordPress that enhances your site with app-like loading behavior.

Radek Mezulanik

Decreasing page load time by progressive loading of images and other elements. They will load just when reach visible part of screen. Lazy loading can be also applied on themes.
Plugin affect these elements:
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<code><img></code> element
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CSS property <code>background-image</code>
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responsive images with <code>srcset</code> attribute
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<code><iframe></code> element
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<code><video></code> element
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Features:
-reduce up to 90% of page load time, depends on elements amount
-compatible with Visual Composer
-compatible with WooCommerce
-you can choose to skip all iframes or just one in specific element
-you can choose to skip specific elements with some class
-you can show elements earlier or later than are visible on the screen
-optional fade in animation

Zedna WP Image Lazy Load

Image lazy load plugin to boost page load time and save bandwidth by removing all the images, background-images, responsive images, iframes and videos …

Frontend Loader vs Zedna WP Image Lazy Load