I'm all about being accurate. It's better to hit slowly than miss quickly. Sure, speed helps with power and a straight shot but if you can't hit the target, speed doesn't matter. Get good at being accurate first, then think about getting faster.
Movie quote " slow is fast and fast is slow" or the saying goes can't miss fast enough. It comes down to mucle memory, you build muscle memory from practicing. If you never practice under stress you won't have muscle memory under stress.