practice... seriously, look into it. There was a time in my life where I was like, I wanna play super fast like Flea, then I got a Mel Bay book called "Percussive Grooves" it gave a lot of info on the use of dead notes. Once you can lay something down... speed it up gradually. Eventually you will play super fast, then you will get sick of it and want to move on to bigger and better things. Good luck.