same experience for me. have been wondering if i was just doing some wrong, or if its just the client zap rendering that is slow. usually I am able to see mutiny confirm that the zap has sent but often Amethyst doesn't correctly refelxt this until I've clicked into a comment and then it refreshes.
Discussion
before the last release it was a lot faster for sending from mutiny. I find myself waiting 30s and having to do multiple tries in order to get a payment through.