This is more of a looking for ergonomic pointers question, as I already have acquired the good habit of starting slowly and not increasing the tempo until I can play it correctly at the slower speed, and then move up incrementally. But I'm having difficulty in getting to the very rapid picking tempo for songs like Limehouse Blues - I'm definitely more limited in getting the right hand speed coordinated than in left hand fingering (from a physiological perspective, as opposed to the theoretical knowledge of learning to put the fingers in the correct locations). In drumming, for instance, I'm adept in letting the wrists go loose and rapidly tremor-like for a side-to-side brush fill, or for single-stroke rolls - but on guitar, when the tempo goes into very rapid single notes like gypsy jazz or the faster bluegrass, my right hand tends to tense up, instead of remaining loose. So, for you experienced players, a couple of questions come to mind for fast single note picking: 1) Do you anchor your palm heel or do you keep the picking hand unanchored? 2) Do you use circle picking? Plus, any other advice is welcome, thanks.