SOPP359: Speeding up fingerwork

This question was sent by Jeremy. And he writes: Speeding up fingerwork. For some reason, my fingers feel sluggish. I have practiced with high fingers (a technique I use in piano) and shortening and lengthening the note values (like swinging or reverse swinging rhythms), but still seem to get stuck at one tempo. Also, have tried Vidas suggestions of stopping on every beat, then every other beat, etc.