Daniel Post

Lazy Embeds replaces your YouTube and Vimeo embeds with a much faster placeholder, which improves the loading time of your website.

Lazy Embeds

Lazy embeds for the WordPress Block Editor. Supports YouTube and Vimeo embeds

marckula

This plugin registers Haiku Deck ( haikudeck.com ) as an oEmbed content provider and adds it to the whitelist, allowing all users to use this provider.
Here’s more information about embeds for WordPress 
https://codex.wordpress.org/Embeds

Haiku Deck for WordPress

Register Haiku Deck as an oEmbed content provider

Lazy Embeds vs Haiku Deck for WordPress