WordPress.org

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.

Oxyplug Team

Oxyplug Image speeds up your website by automatically optimizing your images. It compresses your photos, creates multiple display-ready versions (1X, 2X, 2.8X, and 3X DPRs, including Retina Display quality), and converts them to faster formats like WebP, and (AVIF available in Premium). It also preloads your featured images to improve your Largest Contentful Paint (LCP) and boost your Core Web Vitals score on Google Lighthouse.
Oxyplug Image gives you the flexibility to load images using either the standard tag or the advanced tag for better browser compatibility and performance.
For safety, the plugin automatically saves a backup of your original images, and you can choose how long to keep them (default is 60 days). You can restore any original image at any time during that period. Even if you deactivate or uninstall the plugin, all optimized images remain on your server and continue to work normally.
<h3>Key benefits for everyday users:</h3>
<ul>
<li>Makes images load much faster without losing quality</li>
<li>Creates high-resolution images for Retina screens</li>
<li>Automatically generates 1X, 2X, and 2.8X images (3X Premium)</li>
<li>Helps your site perform better on Google</li>
<li>Fully automatic, no technical skills required</li>
<li>Reduces server load and saves bandwidth</li>
<li>Supports both and tags for maximum flexibility</li>
<li>Bulk image optimization</li>
<li>Safe backup system with user-configurable retention period</li>
</ul>
<h3>(Premium) Features:</h3>
<ul>
<li>AVIF image format</li>
<li>3X DPR image generation</li>
<li>Image and text watermarks</li>
<li>Add copyright information</li>
<li>More image credits</li>
</ul>

Oxyplug Image

Oxyplug Image is a WordPress.org plugin that optimize your site by compressing your images, creating 1X, 2X, 2.8X and 3x images and more...

Image Prioritizer vs Oxyplug Image