I'm sure almost everyone has gone through this before. There's someone that changes their avatar, and you have to wait until it loads. Then they approach you and do something, and you just look at it confused as you have no idea what it is. Maybe you were the person who switched avatars, and you don't understand the reaction of the other person because you have no idea when your avatar will be ready for them to see, so you just sit there for an eternity until they say something about it.
That's why I thought it would be a pretty good idea to have a way to know who didn't download our new avatar yet. It could be something as simple as, I don't know, a spinning arrow next to the username to anyone that is still loading our avatar. That way, a lot of awkward situations could be avoided, and no one would miss your new super duper cool avatar with that one super amazing animation you just added to it as you would know when they can see it.