Playing fast well requires a gradual ramp up in speed in manageable intervals from slow and steady, to fast and steady. This is what I've done for a few flamenco guitar techniques like rasgueo and picado runs, inspired by well-worn teaching methodologies. Pick up the book The Musician's Way, or read the Musician's Way blog if you get a chance.
How do you ramp up the speed without sacrificing quality of sound, tone, attack? Here's a little trick to do that when you work technique into your practice schedule.
Let's assume you've isolated a hurdle you are trying to work past, which to you is a problem related to speed, but could in fact be masking an underlying technical problem that needs to be worked into your muscles, strengthening them at a slower speed.
Find how you want to fit the speedy riff that was difficult into the metronome's time: 3/4, 4/4, etc.
Start at a comfortable speed on the metronome, probably somewhere under 100 bpm
Play the riff at least 5-10 times on the <100 bpm speed, listening to any inaccuracy of execution.
Speed up 10 bpm, play same thing 5-10 times, speed up 10 bpm, play the same, speed up 10 bpm play the same.
Take a break and put it down, or come back to it later. This should envigorate your practice, not wear it out.
How do you ramp up the speed without sacrificing quality of sound, tone, attack? Here's a little trick to do that when you work technique into your practice schedule.
Let's assume you've isolated a hurdle you are trying to work past, which to you is a problem related to speed, but could in fact be masking an underlying technical problem that needs to be worked into your muscles, strengthening them at a slower speed.
Find how you want to fit the speedy riff that was difficult into the metronome's time: 3/4, 4/4, etc.
Start at a comfortable speed on the metronome, probably somewhere under 100 bpm
Play the riff at least 5-10 times on the <100 bpm speed, listening to any inaccuracy of execution.
Speed up 10 bpm, play same thing 5-10 times, speed up 10 bpm, play the same, speed up 10 bpm play the same.
Take a break and put it down, or come back to it later. This should envigorate your practice, not wear it out.