How to make background loading of pages, like in Yandex.Search?

Question

Yandex

I noticed that recently links from Yandex search results are opening suspiciously quickly in the browser.
It seems that Yandex somehow caches the contents of these pages in the browser, loading them in the background.
And how does he do it?
I also want to learn so much )) to, for example, load the background of the page from the main menu of the site.
Thanks for the tip.

Answer 1

External links are unlikely) Internal links are no problem loaded-components for example.