DigiDepot

Tubelastica is a lightweight YouTube embed block for WordPress.
It helps users add a single YouTube video easily in posts, pages, and block-based widget areas. The plugin is designed to work smoothly in narrow sidebar areas, where standard video embeds may cause layout or control issues.
Watch the demo video: 
<a href="https://youtu.be/tk6pFwCn2H0" rel="nofollow ugc">Watch Demo Video</a>
Read the setup guide: 
<a href="https://garmahis.com/tubelastica-a-simple-way-to-add-youtube-videos-to-wordpress/" rel="nofollow ugc">Read the Tubelastica Setup Guide</a>
<h3>Features</h3>
<ul>
<li>Embed a single YouTube video using a block</li>
<li>Lazy loading enabled by default for better performance</li>
<li>Optional caption support</li>
<li>Width control for post and page content</li>
<li>Sidebar-friendly behavior to prevent layout issues</li>
<li>Compatible with block-based widget areas</li>
<li>Lightweight and fast</li>
<li>Custom link option to help keep visitors on your website</li>
</ul>

Tubelastica

Lightweight YouTube embed block with lazy loading and smart behavior for posts and sidebars.

nigro.simone

This plugin, implementing “Lazy Load” technique, avoids download of the pictures and iframe that are not displayed on the screen (for example: images in the bottom of the page) until the user will display them. This improves load speed of page and save the bandwidth.
Configurations are not required! You just have to install it and after the plugin does it all, none further action it’s required. 
This plugin is very light: only 5 kb.

Speed Up – Lazy Load

this plugin just jumped my google speed test by 10 points !

thank you !

Improves load speed of page and save the bandwidth.

Tubelastica vs Speed Up – Lazy Load