The era of “fetching-on-render” and “waterfall hell” inside useEffect is officially behind us. With React 19 widely adopted in 2025, the conversation has shifted from how to use hooks to where your code actually lives.
It’s 3 AM. You’ve just shipped a feature. The logic is sound, the tests pass, but the UI feels… heavy. Input fields lag by a fraction of a second. Animations stutter on mobile devices. You check your network tab—it’s clean. You check your bundle size—it’s optimized.