Video
Video explains things text can't, but a careless embed can add megabytes to the page before anyone presses play.

The Video widget
The free Video widget embeds YouTube, Vimeo, Dailymotion or a self-hosted file. Useful options: start and end time, mute, loop, controls, and Privacy mode for YouTube (uses the youtube-nocookie domain).
Load it lazily
Turn on Image Overlay with your own thumbnail: the page then shows just an image and loads the player when someone clicks. Combined with Lightbox, the video opens in a pop-up and the page stays light. Elementor's lazy-load option for videos does something similar.
Accessibility
- Add captions; many people watch with the sound off.
- Don't autoplay with sound. Muted background videos are fine if they can be paused.
- Summarise the key points in text next to the video for people who won't watch.
Background video
Containers can use a video background. Keep it short (10–20 seconds), compressed and silent, and set a fallback image for mobile, where background video often doesn't play.