I always have a case of the "what ifs" on descents. What if there is gravel in the turn, what if a dog runs out, what if a car crosses the midline. I'm always the slowest down the hill and sometimes it is frustrating but it is safe. Many if not all the fast descenders around here have wrecked, some with very nasty results, and I just don't see the need to join them. If you can't relax you can't let the bike carve through the turn. For me, I try to remain relaxed but at the same time take into account the what ifs. If that makes me slower than some I guess I'm ok with that. BTW, we have some very technical descents. I'm not talking about wide arcing curves with good line of sight.