This new scheme caches entire web pages for faster access. It won't make navigating to a new page any faster than it already is, but for going back and forth, which is pretty common when surfing the web, Google claims this change could improve performance by up to 19 percent. That figure does not tell the whole story, though. Here's a side-by-side comparison that shows how much faster it is in actual usage...
Implementing this change is "not a trivial endeavor," but it sounds as though Google is hopeful it will be accomplished. Furthermore, the alteration to back-and-forth cache would apply to all navigation on both desktop and mobile versions of Chrome.
"Chrome is opting not to use WebKit’s implementation of bfcache due to incompatibility with Chrome’s multiprocess architecture," Osmani explains.
Osmani told CNET that he hopes to test bfcache in 2019 and implement it into Chrome in 2020, so it could still be a year or more for this benefits the general public.