After i've unlocked world quests my dps dropped from 90 to 15 fps. I found it happen only when i have minimized carbonite map opened. And when i point my mouse on this map fps goes back to normal and drop again when carbonite map start fading out. I didn't have that problem before i've unlocked world quests and it's not related to any particular map. I thought it's fade in fade out related because when i was pointing my mouse on map dps was going back to normal but after some playing with transparency options it look like it's not.
ed. it only happen with minimized map not with full map