About sweeping , some people play arpeggios like this one with alternate picking , but you'll come close to the sweeping speed with alternate picking.
To sweep pick this Dmin arp :
1) Pick the E-10 with a down stroke
2) Hammer-on to E-13
3) Continue with the downstrokes up to e-10
4) Pick the 13 with an upstroke
5) Pull-off to e-10
6) Continue with the upstrokes
You can also start the E-10 with an upstroke and downstrike the E-13 instead , if you don't want to hammer on.