Chat Text Bubbles over Player Characters?

[BrachyXIV]

And then there's the memory that needs to be spent on the actual speech bubbles. Each speech bubble needs to know its 3D coordinates, its 2D projected coordinates, its message, and one of (its start time, its expiration time, its visible duration, or its remaining duration). And if the speech bubble is not directly a part of the character's display complex, the position needs to be updated whenever the character moves. The need for speechbubble-to-character tracking could be eliminated if the speech bubble were a part of the character display, but we know how the devs feel about increasing the number of things that can be displayed over characters.

There are a lot of things to consider. It's not as clear cut as it may sound.

How is this any different rom the prisms people already use? that follows them around rendering the oh so memory intensive animated png?