an easy way to speed up is get a very pointy pick. i file mine down with a nail file, i find it helps a lot, all though it makes me bad with unsharp picks.

adding to what jeff said i would sugest u place the uper palm of ur hand. as in the bit near the thumb over the strings that are lower (in pitch) than the string u are picking. as u go down strings use the forarm to move down the strings, keeping ur wrist parrallel to the strings. use the wrist ,and if u want the first finger and thumb to pick.

otherwise just practice with a metronome.