First of all, i'd like to say that i've tried reinstalling and even redownloading the game. So here, I play normally with no problem. After awhile(maybe when I alt tabbing a few times) when im inside any mob/boss map, my game starts to fps drop really hard non stop. Like there's someone clicking on print screen to take pictures constantly and the ''freez'' is for about half a second. (I'm not talking about lag freez btw if any1 misunderstand). The only temporarity ''solution'' I found is to exit the game and enter again and then it all works just fine till it happens again. I just wanna say, once I go to a map town/city, FM or BPQ, it works great, but once I go back to a mob map, it happens again. That's so annoying! It's the first time im experiencing such a thing in my whole maplestory gaming expericne. It has nothing to do with my PC, I have a pretty nice one, and MS shouldn't recuire even a good one lol..