Since dragonfligh lauched I realize some slowdowns when you enter a hunt area. Kinda sucked, but was manageable. On the time rifts are impossible. Any workaround for this issue? thanks
PS: If you disable the ema quest tracker the lag vanish,

I also encountered this issue. The game will freeze for a full minute when a task or bonus objective is being updated in the quest tracker or just entering a zone where there is an ongoing activity like hunts or researcher under fire, you name it. I believe the issue comes from anything that's tracked in blue/purple/red in the quest tracker which represents bonus objectives like bonus bosses in BRD or Uldaman would also freeze the game if you kill it or even World Quests to a certain extent aswell.
So yes, there is no lua error showing when it's happening but there is a major framedrops/freezing issue with the quest tracker regarding bonus objectives, activities in the world, world quests, extra objectives in dungeons etc