Map size based zoom level

I've seen multiple suggestions here to increase the max zoom/unzoom level;
I believe the best way would be to calculate the maximum unzoom as the one who can give a full view of the map, instead of a set value.
I know though that Dungeon Alchemist does not recommend large map sizes, and being able to show the whole map at once can be heavy on performance, but I trust that some things can be done to reduce that impact like an option to disable all animations after a certain level of unzoom that is on by default.