I'm trying to develop a faster tremolo. I'm playing an oud with a risha pick. I'd (hopefully) like to get to this speed of tremolo. My tremolos aren't as fast as I want and become inconsistent at higher speeds. I'm wondering if it's just because the muscles in my wrist haven't fully developed? I haven't been trying for too long only a few weeks about an hour a day. Is it because I need more time to develop more muscle in the wrist, and how long does this typically take to get good at tremolos?
I think this question could be answered by mandolin players as well. As both have strings that are doubled and tremolos are generally done with a pick. Or maybe this could also apply to electric guitarists.