I can't speak as much to the navigational issues but the slow down is probably because we check what images you have now after a title is edited. That process may be taking longer than planned. I may be able to streamline that a little bit better so that it feels more responsive, or at least gives you some feedback to let you know what is happening.
Out of curiosity, when you notice this how many titles were you editing at once? Want to make sure when I start testing I am doing a proper one.