Mobs won't load at Dragonhead area

I am on Exdous server. Every time I go to snowy area, which that will be Dragonhead, there are too many FATE parties there. I believe it slowed down mob load. Every time I go to FATE, the mobs just shows up slowly then sometimes disappears. I having hard time earn rewards from these FATEs.

My connection is fine. Everywhere else working fine and mobs will loads fine but only dragonhead area won't load mobs well. Anyone know why? Maybe too many players or what?

EDIT: I am on PS3 by the way.

PS3 frame rate is too low, happens to me also.

I just go in and spam AOE and I get full reward

Yeah that is what I do all the time now but I just hate not able to see them. Even worse of all, I won't be able to see FATE bosses. Dragon for sure.

You can see them if you aoe to hit them and get really close, but if you back away he disappears.. the problem is of course if you get to close you get hit by the aoe