Tunefox
The Clever Way to Learn & Practice Bluegrass Music
This version uses a lot of scale patterns and partial arpeggios. There's even more in the licks. Knowing and being able to play those patterns well will make learning new tunes, especially fiddle tunes, so much easier. There's some other great options in the licks as well.
This one strips down wonderfully with the difficulty slider. If you need something simple to play at fast speeds it's always a great option to just play less notes!