Authcache settings for blocks or views in panels
Note that each fragment which is loaded from the server results in an additional request. Hence it is beneficial to minimize the amount of fragments and it follows that you should pack all your personalized panes into one request if possible.

Note also that you only can load panels/panes if you place them with page manager. Neither Panelizer nor Mini Panels are supported at the moment (see these issues)

You should not nest authcache fragments. If you do then, the outer most wins. Authcache will not add any fragment placeholders inside fragments loaded via Ajax/ESI.