Watch the C Minor 7th (Root) online guitar lesson by Bruce Arnold from 50 Sweep Picking Guitar Licks You Must Know
The good news is that the economy of picking motion involved with sweep playing allows you to play extremely fast melodies. But when playing at high speed you have to think differently from when you are playing at slower tempos. By this I mean you have to think rhythmically in larger chunks of time. So rather than setting a metronome to one click for one note, or even two, three or four notes equaling one click, you are better off to start thinking in much larger groups of notes played for each click you hear. I call this method "Long Line Rhythm" and it's one of the secrets of speed playing on the guitar whether you are using sweep picking or any other type of playing.
See the PDF for fingering and more information. See "Additional Sweep Jam Tracks" folder for additional rhythm tracks