A presentation at WordPress Kitchen Meetup Summer 2015 in in Kyiv, Ukraine, 02000 by Andrey Savchenko
The following resources were mentioned during the presentation or are useful additional information.
Original slides for the talk.
Fragment Cache is a WordPress plugin for partial and async caching of heavy front-end elements. It currently supports caching navigation menus, widgets, and galleries.
A WordPress transients interface with support for soft-expiration (use old content until new content is available), background updating of the transients (without having to wait for a cron job), and a chainable syntax that allows for one liners.