> You can even update a prop at the top of the component tree and it won't re-render children that didn't actually change (and without you having to orchestrate

> You can even update a prop at the top of the component tree and it won't re-render children that didn't actually change (and without you having to orchestrate that yourself). The number of React apps that render super slowly, with visible delays when typing, is proof that it is easy to make very poorly performing react apps.