Generally, connecting more components to Redux is better for performance. The cost of more `mapState` calls is less than the cost of more "wasted" renders, and

Generally, connecting more components to Redux is better for performance. The cost of more `mapState` calls is less than the cost of more "wasted" renders, and when a component needs smaller pieces of the Redux state, other state changing means it's not affected. See my post "Practical Redux, Part 6: Connected Lists and Performance" [0] and the Redux FAQ entry on using React-Redux [1] for more details. Also, we're completely rewriting the React-Redux docs from scratch, and they now have their own site [2] . We've got some new tutorial material available, and a guide section on writing `mapState` functions. The new section on using `mapDispatch` should be up soon, and we've got a lot more planned, including sections on writing selectors, performance optimizations, and how React-Redux works internally. [0] https://blog.isquaredsoftware.com/2017/01/practical-redux-part-6-connected-lists-forms-and-performance/ https://blog.isquaredsoftware.com/2017/01/practical-redux-pa... [1] https://redux.js.org/faq/reactredux https://redux.js.org/faq/reactredux [2] https://react-redux.js.org https://react-redux.js.org