I dunno why but it seems like load priority is(from most to least)

Some random player within 30m> random players outside of 30m> minions within 30m> minions outside of 30m> party members within 30m> party members outside of 30m> low priority mobs like passive mobs within 30m> low priority mobs outside of 30m> medium priority mobs(aka aggressive but not hunt or attacking) within 30m> medium priority mobs outside of 30m>chocobos within 30m> chocobos outside 30m> high priority mobs(hunts or mobs attacking you or players) with 30m> high priority mobs outside of 30m> low priority npcs within 30m> low priority npcs outside of 30m> medium priority npcs(quest npcs not blue or MSQ or traders) with 30m> medium priority npcs outside of 30m> blue quest NPCs within 30m> blue quest NPCs outside of 30m> everything else> MSQ NPCs within 30m> MSQ NPCs outside of 30m.