How to load only half of the homepage and the rest on scroll?

Hello guys, today I found a site that only loaded half of the content and loaded the rest of the homepage after I use the scroll bar. This makes the page super fast to load. Does anyone know how to do this in WordPress?

Thank you in advance!

 

Try google-ing "wordpress lazy load".
I haven't tried any of them though

 

It's called lazy loading, Many new themes support it or you can use plugins like WP Rocket, to provide support for it if your theme doesn’t.

 

Thank you for your responses, @hdewantara @ArtificialIntelligence

I know lazy loading but only works for images, videos, and iframes.
I'm already using WP-Rocket but is not working the way I need.

For example, look at this NSFW site:

https://theporndude.com

Code (markup):

(Adult content)

Does anyone know how he's doing?

Thank you in advance