Embed Optimizer

This plugin’s purpose is to optimize the performance of embeds in WordPress, such as Tweets, YouTube videos, TikToks, and others.

The current optimizations include:

1. Lazy loading embeds just before they come into view.
2. Adding dns-prefetch links for embeds in the initial viewport.
3. Reserving space for embeds that resize to reduce layout shifting.

Lazy loading embeds improves performance because embeds are generally very resource-intensive, so lazy loading them ensures that they don’t compete with resources when the page is loading. Lazy loading of IFRAME-based embeds is handled simply by adding the loading=lazy attribute. Lazy loading embeds that include SCRIPT tags is handled by using an Intersection Observer to watch for when the embed’s FIGURE container is going to ente…