I guess a lot boils down to how you run your games. For npcs in my games, most don't end up getting a character sheet or a token. Instead, they are a handout with some character art, likely with the handout being editable by players so that they can put notes on that npc there if they wish. I only create sheets/tokens for npcs that I really expect to enter combat and need a full slate of abilities. If an npc just needs a roll or 2 (like merchants needing some sort of appraise or lore rolls), then I often put bonuses to certain rolls in the GM notes area, or build the roll(s) as text links in the handout. In the case of npcs with actual character sheets, I don't usually move them out unless I feel it is unlikely the characters will be interacting with them again at all or for a very long time. I use multiple library games. Some are game system specific like Pathfinder Character Library or Palladium Bestiary, while others are more universal like City Buildings Library or Underground Maps Library. This is mainly for organization to make finding things in the Transmogrifier list easier. Maps are usually (for me anyway) the easiest bits to anticipate the need for. They are also pretty quick to drop in and use as long as you have a decent naming scheme for your maps. I have no idea how lazy loading has impacted maps, but they certainly add up in the overall data "size" of your game. As far as the "I can't be the first" comment, you aren't as far as game size goes. What I have seen a few times in the past cross the forums was that after a game crosses a data "size" threshold (which I am sure changes as technology advances), then certain functions stopped working like copying a game. At that point, the game was so large that the Amazon servers were timing out during the copy. That meant that rollbacks no longer worked either, because the automatic copies the the rollback feature relies on had been failing. If you are able to copy your game, then you should be free from that particular issue.
