Want to play fast? Get out your metronome and start playing a scale. Play it up and down 2 times fast and stop. If it's clean raise the tempo 5 and do it again up and down 2 times and stop. If it's clean raise tempo and repeat. If not try again at present tempo till played clean. DO this every day for every scale. You will get faster in time. How long till your happy with your speed no one can say. The trick once your fast is to make it sound like music. I think it's more fun to try and make music and let speed come in time.