>>417768154
>>417768227
Sorry, I just missed the fact that this is a big atlas for a bunch of posters. In that case a single 8k texture is fine.
I don't know if you really should worry about crunch-compressing it though, it still takes up the full size in VRAM. It MIGHT decrease download size of your world/avatar just a little, but bundles are already compressed so this will probably shave off a lot less than you think.