Its performance is not very different from the system versions of grep, which shows that the recursive technique is not too costly and that it's not worth trying to tune the code.

Optimization in this case is nothing crazy, just something I neglected while designing the framework.

In the vast majority of cases there’s nothing wrong about wasted renders. They take so little resources that it is simply undetectable for a human eye. In fact, comparing each component’s props to its previous props shallowly (I’m not even talking about deeply) can be more resource extensive then simply re-rendering the entire subtree.

"Premature optimization is the root of all evil"; start with RPC as default and later switch to REST or GraphQL when (and only if!) the need arises.