No, there is optimization happening at Redux level to ensure components only gets updated when they need to, but it's up to you to ensure your store is properly designed and consumed to avoid unnecessary updates.

Look up Mark Erikson's blog[1], who's a Redux maintainer, for a lot of details on Redux's internals (acemarke on HN), he also answers tons of questions everywhere[2] about Redux, he helped me so much understand it!

[1] https://blog.isquaredsoftware.com/ [2] https://stackoverflow.com/a/40386189