Today I was talking to some friends about fast alternate picking technique, and differences when you pick mostly with your wrist vs. with your arm. Malmsteen and Paul Gilbert are great examples of relaxed picking, movement comes mostly from wrist. Until years ago John Petrucci also used his wrist a lot more, but at some point he started picking with his arm, just like Zakk Wylde and Timo Tolkki. These two videos can show the difference. "As I Am" solo in 2004, starts at 5:43, perfect execution, relaxed wrist movement: "As I Am" solo in 2015, starts at 5:28, missing notes, sometimes off-tempo, tense arm movement: So what the hell? Maybe he's not practicing anymore? I refuse to believe it has something to do with aging: it should be the opposite, the older one becomes, more technique one develops to play more effortlessly.