When playn´ chroma scale for ex. at 240 bpm, it´s much easyer for me to play it at 200 and up than to play it at 140-160 bpm. While playn´ fast for about 25 min. it can be a little hard to play slower things because my mind is allready programed to play fast and that´s why the slower things miss the right feel but if I than play slow for about 10 min, the feel gets back and the speed increases some more (250 bpm) ´cause of the rest and whalla, ready to kick ass no metter playn´ blues our shred.