Weston Ruter

This plugin adds the <code>loading=lazy</code> attribute to <code>iframe</code> elements coming from oEmbeds. In WordPress 5.5, <code>loading=lazy</code> is added to images per <a href="https://core.trac.wordpress.org/ticket/44427" rel="nofollow ugc">#44427</a>, and in 5.7 it is being added to iframes as well per <a href="https://core.trac.wordpress.org/ticket/50756" rel="nofollow ugc">#50756</a>.
This plugin will be obsolete by the time WordPress 5.7 is released. When that happens, this plugin will do nothing.

Lazy Loading oEmbed Iframes

Add the loading=lazy attribute to iframes coming from oEmbeds in content

Arunas Liuiza

Stanislav Khromov

Content Cards make ordinary web links great by making it possible to embed a beautiful Content Card to link to any web site.
By using OpenGraph data, Content Cards grabs the title, description and associated image to the links you embed – it’s similar to how you can embed other websites, such as YouTube, Twitter, SoundCloud and more.
For individual links, You can insert a Content Card via shortcode <code>[contentcards url="http://yoursite.com/article-1"]</code>. If you often use Content Cards for some website, you can register the domain name (for example: <code>yoursite.com</code>) as an oEmbed provider via Plugin’s Settings page and then it will behave the same way other oEmbed providers do – you will just have to paste plaintext link to a separate paragraph an Content Card will be generated automatically.
This plugin was built by <a href="http://arunas.co" rel="nofollow ugc">Arūnas Liuiza</a> and <a href="http://snippets.khromov.se/" rel="nofollow ugc">Stanislav Khromov</a>. It is being developed on <a href="http://github.com/ideag/content-cards" rel="nofollow ugc">GitHub</a>. If you have any questions, issues, need support, or want to contribute, please let us know <a href="http://github.com/ideag/content-cards/issues" rel="nofollow ugc">here</a>.
We are machines that convert coffee into code, so feel free to <a href="http://arunas.co#coffee" rel="nofollow ugc">buy us a cup</a>. Or two. Or ten.
Also, please check out our other plugins:
<ul>
<li>Arūnas: <a href="http://arunas.co/gust" rel="nofollow ugc">Gust</a>, <a href="http://arunas.co/tinycoffee" rel="nofollow ugc">tinyCoffee</a>, <a href="http://arunas.co/tinysocial" rel="nofollow ugc">tinySocial</a>, <a href="http://arunas.co/tinytoc" rel="nofollow ugc">tinyTOC</a>, <a href="http://arunas.co/tinyip" rel="nofollow ugc">tinyIP</a> (premium) and <a href="http://arunas.co/gust" rel="nofollow ugc">Post Section Voting</a></li>
<li>Stanislav: <a href="https://wordpress.org/plugins/instant-articles" rel="ugc">WordPress Instant Articles</a>, <a href="https://wordpress.org/plugins/view-template-widget-for-toolset-types-views/" rel="ugc">Content Template Widget for Toolset Views</a>, <a href="https://wordpress.org/plugins/email-obfuscate-shortcode/" rel="ugc">Email Obfuscate Shortcode</a>, <a href="https://wordpress.org/plugins/english-wp-admin/" rel="ugc">English WordPress Admin</a>, <a href="https://wordpress.org/plugins/distraction-free-writing-mode-themes/" rel="ugc">Distraction Free Writing mode Themes</a>, <a href="https://wordpress.org/plugins/thumbnail-upscale/" rel="ugc">Thumbnail Upscale</a>, <a href="https://wordpress.org/plugins/wp-users-media/" rel="ugc">WP Users Media</a> and <a href="https://wordpress.org/plugins/views-output-formats/" rel="ugc">Views Output Formats</a></li>
</ul>

Content Cards

Worked great

I checked my media library, no issue with cached images as previously reported

Works great

Embed any link from the web easily as a beautiful Content Card.

Lazy Loading oEmbed Iframes vs Content Cards