Here is a first-look of an early prototype of back/forward cache in action on desktop:
We also have a preview of the back/forward cache working on Chrome for Android:
We estimate this change could improve the performance of up to 19% of all navigations for mobile Chrome. You can find more detail about this feature in the bfcache explainer.
There is medium cross-browser interop risk with this change. Both Firefox and Safari already have back-forward cache implementations that are subtly different. Chrome is opting not to use WebKit's implementation of bfcache due to incompatibility with Chrome's multi-process architecture.
Our formal intent-to-implement for the back-forward cache is on blink-dev for anyone wishing to contribute to the discussions.
Thanks to Arthur Sonzogni, Alexander Timin, Kenji Baheux, and Sami for their help putting together our prototype videos.