
Back-forward caches provides instantaneous page loading when navigating backward or forward. Devs want to experimentally introduce the feature on all of Chrome’s desktop platforms, i.e. Windows, macOS and Linux, in the upcoming Google Chrome 92 release, but you can still access this feature on latest version of Chrome i.e. v90.0.44.
Regarding this feature Google developer says -
“Back-forward cache is a browser feature which improves the user experience by keeping a page alive after the user navigates away from it and reuses it for session history navigation (browser back/forward buttons, history.back(), etc) to make the navigation instant. The pages in the cache are frozen and do not run any javascript,”

chrome://flags/#back-forward-cache
Several options are available here, including experimental support for caching across all pages, or just those on the same site. This will be very useful feature which will speed up the inter-site navigation and also takes less data to load the page. From a change that speeds up browsing to one that speeds up sharing: Google’s Chrome team is working on an improved ‘share hub’ to make it easier to send web pages to other people and other devices.