I've get some pretty good runs, but only when I drink too much coffee...
Seriously though, if you want some good stuff for getting even faster, try running permutations. find a 4 fret position that is easy on your hand, and play every combination of notes, on every string. Start with 1234, and go all the way through to 4321. Then try it skipping strings. I've been doing this for about a year now, and I'm getting pretty fast. Another year, and It'll just be a blur.