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This plugin optimizes the loading of images (and videos) with prioritization to improve <a href="https://web.dev/articles/lcp" rel="nofollow ugc">Largest Contentful Paint</a> (LCP), lazy loading, and more accurate image size selection.
The current optimizations include:
<ol>
<li>Add breakpoint-specific <code>fetchpriority=high</code> preload links (both as <code>LINK[rel=preload]</code> elements and <code>Link</code> response headers) for image URLs of LCP elements:
<ol>
<li>An <code>IMG</code> element, including the <code>srcset</code>/<code>sizes</code> attributes supplied as <code>imagesrcset</code>/<code>imagesizes</code> on the <code>LINK</code>.</li>
<li>The first <code>SOURCE</code> element with a <code>type</code> attribute in a <code>PICTURE</code> element. (Art-directed <code>PICTURE</code> elements using media queries are not supported.)</li>
<li>An element with a CSS <code>background-image</code> inline <code>style</code> attribute.</li>
<li>An element with a CSS <code>background-image</code> applied with a stylesheet (when the image is from an allowed origin).</li>
<li>A <code>VIDEO</code> element’s <code>poster</code> image.</li>
</ol>
</li>
<li>Ensure <code>fetchpriority=high</code> is only added to an <code>IMG</code> when it is the LCP element across all responsive breakpoints.</li>
<li>Add <code>fetchpriority=low</code> to <code>IMG</code> tags which appear in the initial viewport but are not visible, such as when they are subsequent carousel slides.</li>
<li>Lazy loading:
<ol>
<li>Apply lazy loading to <code>IMG</code> tags based on whether they appear in any breakpoint’s initial viewport.</li>
<li>Implement lazy loading of CSS background images added via inline <code>style</code> attributes.</li>
<li>Lazy-load <code>VIDEO</code> tags by setting the appropriate attributes based on whether they appear in the initial viewport. If a <code>VIDEO</code> is the LCP element, it gets <code>preload=auto</code>; if it is in an initial viewport, the <code>preload=metadata</code> default is left; if it is not in an initial viewport, it gets <code>preload=none</code>. Lazy-loaded videos also get initial <code>preload</code>, <code>autoplay</code>, and <code>poster</code> attributes restored when the <code>VIDEO</code> is going to enter the viewport.</li>
</ol>
</li>
<li>Responsive image sizes:
<ol>
<li>Compute the <code>sizes</code> attribute using the widths of an image collected from URL Metrics for each breakpoint (when not lazy-loaded since then handled by <code>sizes=auto</code>).</li>
<li>Ensure <a href="https://make.wordpress.org/core/2024/10/18/auto-sizes-for-lazy-loaded-images-in-wordpress-6-7/" rel="nofollow ugc"><code>sizes=auto</code></a> is set on <code>IMG</code> tags after setting correct lazy-loading (above).</li>
</ol>
</li>
<li>Reduce the size of the <code>poster</code> image of a <code>VIDEO</code> from full size to the size appropriate for the maximum width of the video (on desktop).</li>
</ol>
This plugin requires the <a href="https://wordpress.org/plugins/optimization-detective/" rel="ugc">Optimization Detective</a> plugin as a dependency. Please refer to that plugin for additional background on how this plugin works as well as additional developer options.
👉 Note: This plugin optimizes pages for actual visitors, and it depends on visitors to optimize pages. As such, you won’t see optimizations applied immediately after activating the plugin. Please wait for URL Metrics to be gathered for both mobile and desktop visits. And since administrator users are not normal visitors typically, optimizations are not applied for admins by default.
Your site must have the REST API accessible to unauthenticated frontend visitors since this is how metrics are collected about how a page should be optimized. There are currently no settings and no user interface for this plugin since it is designed to work without any configuration.

Image Prioritizer

Prioritizes the loading of images and videos based on how they appear to actual visitors: adds fetchpriority, preloads, lazy-loads, and sets sizes.

Uzair

Easy Optimizer is a simple and lightweight plugin that helps improve your website’s performance by: 
– Lazy-loading images, background images, iframes and videos 
– Preloading pages to speed up navigations 
– Optionally rewriting image URLs to a ShortPixel CDN for next-gen format delivery (WebP/AVIF) and optimization
<h3>Key Features</h3>
<ul>
<li>Serve images in next-gen formats via ShortPixel CDN (WebP/AVIF when supported).</li>
<li>Lazy-load images and iframes to reduce initial page weight.</li>
<li>Lazy-load background images and HTML5 videos.</li>
<li>Page preloading to improve perceived navigation speed.</li>
<li>Elementor compatible.</li>
</ul>
<h3>External Services</h3>
This plugin optionally rewrites image URLs to ShortPixel’s CDN to serve optimized images:
<ul>
<li>Service: ShortPixel CDN (https://cdn.shortpixel.ai/)</li>
<li>What it does: When “Image Optimization” is enabled in plugin settings, image URLs on your site (for example, https://example.com/wp-content/uploads/image.jpg) are rewritten so that visitors’ browsers request images from ShortPixel’s CDN (for example, https://cdn.shortpixel.ai/spai/…/https://example.com/wp-content/uploads/image.jpg). This enables ShortPixel to serve optimized, next-gen formats like WebP/AVIF where supported.</li>
<li>What data is sent: Only the image URL requested by the visitor’s browser is requested from ShortPixel’s CDN. No additional site data or personal user data is sent by the plugin itself.</li>
<li>Why: Using the CDN can reduce image weight and speed delivery of images.</li>
<li>Links: ShortPixel Privacy Policy: https://shortpixel.com/privacy 
 ShortPixel Terms of Service: https://shortpixel.com/terms-of-service</li>
</ul>

Easy Optimizer – Lazy-load images, videos & iframes

Convert images to WebP/AVIF via ShortPixel CDN, lazy-load images/backgrounds/iframes/videos and preload pages for faster navigation.

Image Prioritizer vs Easy Optimizer – Lazy-load images, videos & iframes