These DC's are more than likely linked to the number of mobs/meso sacks on screen, as well as the mob death animations, skill animations, rebirth/leveling animations, and the speed at which you are spawning/killing mobs. I did work on a couple of other servers just reducing the sizes of image files or getting rid of animation frames for such things to solve this same issue, because it's basically an overload of so many things happening that causes them. The good thing is that it's a client-sided issue and that it can be fixed with some edits 
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