Latency issues with pof only

normally my ping sits at somewhere around 90. I have bad internet so lag issues do pop up regularly anyway. However in any pof map this goes up to 120-150, and when entering combat it goes up to 600-800 making the game practically unplayable. When out of combat it goes back down to around 150. Edit: now that i think of it, i have the combat issue elsewhere too, just not as severe outside of pof