TL;DR: YouTube Embeds are unnecessarily large and inefficient, not sharing resources between multiple embeds. Lite-youtube Web Component provides a smaller alternative, maintaining functionality while reducing size and improving performance. You can easily embed YouTube videos on any website. YouTube’s current embed code is bloated and inefficient. The solution is using Lite YouTube Embed Web Component which loads videos 224x faster with significantly less data transfer. The default embed experience is replicated with Lite YouTube Embed, offering a faster, more efficient, and environmentally friendly solution. Google’s lightweight web component, lite-youtube-embed, is recommended for a better video embedding experience.
https://frontendmasters.com/blog/youtube-embeds-are-bananas-heavy-and-its-fixable/