This suggestion may have been made before, (but could not find a related post), but is it possible for a an Offline mode for the game where you can just view your heroes?
The idea is just to have a read-only (not updates to server) mode where you can just view your heroes.
Understand the game is quite complex with all your building progress sync’ed back to the server, but perhaps those could be just an estimate in the view-only offline mode.
In any case, hopefully this suggestion may be considered by the Empire & Puzzles team…