Game is slow like hell

Describe the problem. Be as specific as possible!: I dont really know if its my computer or the game but i havent played for almost 1 month and today i logged in to the game and went to my zero. Logged in and started to move to maple world but when i got there the game started to be slow like hell: Charecter stuck even when i press buttons, and he walkes in deley and it's hard to play the game because the charecter dont respond in time...
Is it because my computer or the game? one friend from my guild told me he have the same problem sometimes...

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