Part of implementing an efficient React app is making sure that prop&#x2F;state transitions are minimized. Coincidentally, this is also (abstractly) true about any UI technology, not just React. But React sacrifices a little bit of speed in order to make the UI declarative, as opposed to the finicky, error-prone and messy way we used to do it before with frameworks like Backbone.<p>Have you actually developed a large React app? Because you might be surprised at how fast React really is in practice.