Stop Murdering Your React App: A Buttery Smooth Scroll-To-Top Component

We’ve all been there. You’re reading a brilliant, massive piece of content, you hit the bottom, and suddenly you have to manually scroll all the way back up like it’s 2004. Dropping a "Scroll to Top" button into your React app is a no-brainer for user experience. But if you aren't careful, that tiny little convenience button can absolutely tank your app's performance. Today, I’m going to share a highly optimized, buttery smooth ScrollToTop component that rescues your users without causing a chaotic avalanche of React re-renders. The Trap: Tracking Every Single Pixel When I first built one of these, I fell into the classic trap: storing the exact window.scrollY position in React state. Here is the brutal reality of that approach: every single pixel your user scrolls triggers a state update. If they scroll down a long page, you are forcing your component to re-render hundreds of times a second. It’s a massive resource hog for absolutely no reason. The Solution: Threshold State & CSS Wiza