Maplestory

When i play the game, it starts to lag very badly... the mouse jumps across the screen making it impossible for me to set AP or SP... and when i press jump it jumps 5-7 times before stopping

hey I've tried to play pirates fury.. the game connects fine and everything is ok but when the actual game itself starts, my character jumps by itself and the mouse is rly jumpy, plus when i tried to apply SP or AP, it applied it all at once, and i started at level 20, altho not sure if that's suppo...