[dangoor]

Premature optimization is the root of all evil. Using immutable objects means that the overhead for checking a component that has not changed what it's rendering is a couple of function calls plus an object identity check. Modern JS can do that very, very fast.

And, if you find that it's still too slow, there are other strategies you can employ to fix it without having to turn your whole application into a stateful soup. Odds are, though, that this is not going to be your bottleneck.