Don Neufeld (SOE dev) posted on here (too lazy to search) that the IconBank is more efficient (I suppose less polygons, and maybe the textures for the icons are loaded in one go?).
I do not know whether the other windows using icons will be updated in due course - or there is the possibility that the IconBank is not an efficient way to display constantly changing icons such as effects or maintained spells. This is pure speculation on my part though, I have no official word on this.
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