I don't use context so I don't know if this is true or not. It might think it has to re-render since the context could affect anything below a component. It sho

I don't use context so I don't know if this is true or not. It might think it has to re-render since the context could affect anything below a component. It should however use the virtual DOM to diff first and not update the actual DOM more than needed. For class components in react you also have a special method shouldComponentUpdate that you can write to optimize things. But I feel we are into performance details now, it doesn't make the code hard to understand. You updated a value in the context and some component re-renderd, hopefully with the correct output.