Nico

Minimalistic lazyloading, loads images as they come into view. Adds native lazyloading to all images and embeds (Chrome) and adds a polyfill (1.07 KiB gzipped) to make it work in all browsers.
<ul>
<li><a href="https://nextgenthemes.com/plugins/native-lazyload-polyfill/" rel="nofollow ugc">Homepage</a></li>
<li><a href="https://gitlab.com/nnico/native-lazyload-polyfill" rel="nofollow ugc">Gitlab</a></li>
</ul>
<h3>How it works technically (if you care)</h3>
<ul>
<li>Adds <code>loading="lazy"</code> to all <code><img></code> and <code><iframe></code> inside <code>the_content</code> and other areas.</li>
<li>Also wraps <code><img></code>, <code><iframe></code> and the content of <code><pictures></code> in <code><noscript></code>.</li>
<li>Adds the <a href="https://github.com/mfranzke/loading-attribute-polyfill" rel="nofollow ugc">loading-attribute-polyfill</a> to do its magic in JavaScript.</li>
</ul>
Feedback/Help is very welcome.

Native Lazyload + Polyfill

Adds native lazyloading to all images and embeds (Chrome) and adds a polyfill to make it work in all browsers.

Arya Dhiratara

Think Digital Agency

A drop dead simple and lightweight image, iframe, and video optimization plugin to satisfy Google PageSpeed Insights, Lighthouse, and overall user experience.
This tiny little plugin (around 14kb zipped) will automatically
<ul>
<li>lazyload your below the fold images/iframes/videos,</li>
<li>preload your featured images (should also works well with WooCommerce product featured image),</li>
<li>add loading=”eager” to your featured image and all images that have <code>no-lazy</code> or <code>skip-lazy</code> class.</li>
<li>add missing image dimension to images that doesn’t have width and height attribute</li>
</ul>
<h3>Features</h3>
<ul>
<li>Lazy Load:
<ul>
<li>Images, iframes, and videos.</li>
<li>Inline background images.</li>
<li>CSS background image (simply put <code>lazyload</code> class to the background image container)</li>
</ul>
</li>
<li>Preload Featured Images 
Automatically preloading featured image from common page/post (homepage, pages except homepage, single post, and WooCommerce single product pages)</li>
<li>Add loading=”eager” attribute to to your featured image and all images that have <code>no-lazy</code> or <code>skip-lazy</code> class.</li>
<li>Add missing image dimension to images that doesn’t have width and height attribute [since 1.0.3]</li>
</ul>
Should works well with all page builders and theme builders. This plugin also able to lazy loading WooCommerce images and preloading WooCommerce product featured images.
<h3>Disclaimer</h3>
<ul>
<li>Lazy load feature are using Lazysizes library (around 3kb, gzipped and minified).</li>
<li>This plugin doesn’t add anything to your database since there’s no settings and options. Everything will automatically activated after you activate the plugin.</li>
<li>You can change some default settings using filter.</li>
<li>This plugin is the simplified version of <a href="https://wordpress.org/plugins/optimize-more-images/" rel="ugc">Optimize More! – Images</a>, if you don’t want to use filters and need to control the settings with UI, you can try that plugin instead of this one.</li>
</ul>
<h3>About Lazysizes</h3>
Lazysizes is highly performant lazy load library, written by Alexander Farkas in pure JS with no dependencies.
Taken from lazysize’s github description: 
High performance and SEO friendly lazy loader for images (responsive and normal), iframes and more, that detects any visibility changes triggered through user interaction, CSS or JavaScript without configuration.
<h3>Filters</h3>
Example filter to add extra lazyload exclude list:
<pre><code>add_filter( 'lpam_extra_exclude_list', function($lpam_extra_exclude_list) {
 return array( 
 'my-logo', 'my-hero-img', 'exclude-lazy'
 );
} );
</code></pre>
Example filter to change lazysizes config (Read the <a href="https://github.com/aFarkas/lazysizes/#js-api---options" rel="nofollow ugc">docs</a>):
<pre><code>add_filter( 'lpam_lazysizes_js_before', function($lpam_lazysizes_js_before) {
 return 'window.lazySizesConfig = {
 expand: 500,
 threshold: 500
 };'
} );
</code></pre>
Example filter to change the image sizes for preload featured image:
<pre><code>add_filter( 'lpam_preload_featured_images_image_size', function($image_size, $post) {
 if ( is_singular( 'post' ) ) { return 'large'; }
 elseif ( is_singular( 'product' ) ) { return 'full'; }
 else { return $image_size; }
}, 10, 2 );
</code></pre>
[new since 1.0.2] Example to disable the preload featured image feature in certain page-type:
<pre><code>add_filter('disable_featured_image_preload', function ($disable) {
 if ( is_singular( 'post' ) ) {
 return true;
 }
});
</code></pre>
[new since 1.0.3] Example to disable adding image dimension in certain page-type:
<pre><code>add_filter('disable_img_dimension', function ($disable) {
 if ( is_singular( 'post' ) ) {
 return true;
 }
});
</code></pre>
[new since 1.0.3] Example to disable this plugin completely in certain page using url:
<pre><code>add_filter('lazy_load_excluded_pages', function ($excludedPages) {
 $excludedPages[] = '/page-1';
 $excludedPages[] = '/page-2';
 return $excludedPages;
});
</code></pre>
[new since 1.0.3] Example to disable this plugin completely in certain page using page ID:
<pre><code>add_filter('lazy_load_excluded_page_ids', function ($excludedPageIDs) {
 $excludedPageIDs[] = 3678; // Exclude page with ID 1
 $excludedPageIDs[] = 3615; // Exclude page with ID 2
 return $excludedPageIDs;
});
</code></pre>
[new since 1.0.4] To disable the tag:
<pre><code>add_filter('disable_noscript', '__return_true');
</code></pre>
 
<h3>USEFUL PLUGINS TO OPTIMIZE YOUR SITE’S SPEED:</h3>
<ul>
<li>
<a href="https://wordpress.org/plugins/optimize-more/" rel="ugc">Optimize More!</a>: A Do It Yourself WordPress Optimization Plugin that give you the ability to:
<ul>
<li>
Load CSS Asynchronously – selectively load CSS file(s) asynchronously on selected post/page types.
</li>
<li>
Delay CSS and JS until User Interaction – selectively delay CSS/JS load until user interaction on selected post/page types.
</li>
<li>
Preload Critical CSS, JS, and Font Files – selectively preload critical CSS/JS/Font file(s) on selected post/page types.
</li>
<li>
Remove Unused CSS and JS Files – selectively remove unused CSS/JS file(s) on selected post/page types.
</li>
<li>
Defer JS – selectively defer loading JavaScript file(s) on selected post/page types.
</li>
<li>
Advance Defer JS – hold JavaScripts load until everything else has been loaded. Adapted from the legendary varvy’s defer js method *recommended for defer loading 3rd party scripts like ads, pixels, and trackers
</li>
<li>
Load Gutenberg CSS conditionally
</li>
<li>
Remove Passive Listener Warnings
</li>
<li>and many more</li>
</ul>
</li>
</ul>
<h3>Other USEFUL PLUGIN:</h3>
<ul>
<li>
<a href="https://wordpress.org/plugins/shop-extra/" rel="ugc">Shop Extra</a> – A lightweight plugin to optimize your WooCommerce & Business site that makes you able to:
<ul>
<li>add Floating WhatsApp Chat Widget (can be use without WooCommerce),</li>
<li>add WhatsApp Order Button for WooCommrece,</li>
<li>Hide/Disable WooCommerce Elements,</li>
<li>WooCommerce Strings Translations,</li>
<li>and many more.</li>
</ul>
</li>
<li>
<a href="https://wordpress.org/plugins/animate-on-scroll/" rel="ugc">Animate on Scroll</a> – Animate any Elements on scroll using the popular AOS JS library simply by adding class names. This plugin helps you integrate easily with AOS JS library to add any AOS animations to WordPress. Simply add the desired AOS animation to your element class name with “aos-” prefix and the plugin will add the corresponding aos attribute to the element tag.
</li>
</ul>
<h3>Optimize More!</h3>
Need to optimize more? Try my <a href="https://thinkdigital.co.id/services/speed-optimization/" rel="nofollow ugc">WordPress Page Speed Optimization’s Service</a>.

Lazyload, Preload, and More!

A drop dead simple and lightweight image, iframe, and video optimization plugin to satisfy Google PageSpeed Insights and Core Web Vitals.

Native Lazyload + Polyfill vs Lazyload, Preload, and More!