Those arps aren´t that fast man, but pretty difficult. Now I know some folks sweep some parts but I use alternate pickin´ throughout. It goes somthing around 140 bpm (16-notes) but I can reach only to 130. But it´s also harder to play that with metronome cause evrything must be even. If you listen to crossroads verision, some parts are faster than others so if I play whitout metronome, I can do some easyer arps from the piece at 140 but than there are some where I need to slow down to 125-130.

Those arps are an amazing technique work out. I like the verision of Caprice 5 wich comes right after. That one is much easyer though.