Yep, it absolutely does. See http://redux.js.org/docs/faq/Performance.html#performance-sc... for answers on that specific topic, as well as a list of some real apps and use stories at https://github.com/markerikson/redux-ecosystem-links/blob/ma... .

Very much so... it's a very good fit (though how you extend things will vary) from just past trivial projects, to fairly large. Very few projects are too large for redux to be a decent fit.