I want to increase my speed a bit, nothing insanely fast, but I want some fast passages such as 16th notes at 140bpm (picking) to be fairly comfortable. my left hand fingers tend to be slow, but I can make up for this with hammers and pulls, main problem is my picking loses precision and control at about 16th notes at 120bpm. How much time do you spend on speed, I don't like doing it, so I'm thinking maybe 30 min a day playing an etude and just pushing it that way. Think thats enough? Have other suggestions?