Anti aliasing is a technique which increases the screen resolution ( 2x ,4x , 8x etc.) and then scales it down again to fit your selected resolution.
example: running at 1400x900 (126000 pixels) resolution with 2x AA actually renders the game at 2520000 pixels but then scales it down to its original resolution when being drawn to screen-space again.
What resolution do you run the game at and how much anti-aliasing?
FFXI 2003-2007: Elaron ~Phoenix
FFXIV 2010-> : Gus Morgan ~Wutai