Most slow React apps share the same hidden issues — and none of them are React itself. When a React app starts feeling sluggish, the first instinct is to blame React. Spoiler: it's almost never React. 🧠 React is not slow by default React is actually very fast at what it does: It batches updates It uses a virtual DOM It only touches the real DOM when necessary So if your app feels slow, React is usually just doing extra work because we told it to . ⚠️ The real reason apps feel slow Most performance issues come from unnecessary re-renders and heavy work inside renders . Let's break down the common causes. 🔁 1. Unnecessary re-renders Every time state changes, React re-runs components — even ones that don't depend on that state. function App () { const [ count , setCount ] = React .…