Shankar Yadav’s Post

🚀 **Struggling with slow React/Next.js apps? Here’s a game-changer: Code Splitting** Most apps fail at performance for one simple reason: 👉 They ship *everything* at once. 💡 **Code Splitting in Next.js** fixes this by loading only what’s needed, when it’s needed. ⚙️ **How it works:** * Each page gets its own JavaScript bundle * Users only download code for the page they visit * Shared code is optimized automatically 📦 **Want more control? Use dynamic imports:** ```js import dynamic from 'next/dynamic'; const HeavyComponent = dynamic(() => import('../components/HeavyComponent')); ``` ✨ This means: * Faster initial load ⚡ * Smaller bundle size 📉 * Better user experience 😌 🧠 **Real talk:** Performance isn’t just a “nice to have” anymore—it’s expected. If you're not optimizing your app, you're already behind. 💬 Are you using code splitting in your projects yet? #NextJS #ReactJS #WebPerformance #Frontend #JavaScript #Coding #BuildInPublic

I just learned something that completely changed how I think about React apps. React Router. Before this, I didn't understand how single page applications actually navigate between pages without reloading the browser. It felt like magic. Now I get it. Here's what React Router taught me: ✅ A React app is ONE page — but can feel like many ✅ Routes control what component shows up at each URL ✅ No full page reload = faster, smoother user experience ✅ Nested routes let you build complex layouts cleanly ✅ useNavigate() and Link replace the traditional anchor tag Something as simple as navigating between a Home page and an About page suddenly made the whole concept of SPAs click for me. This is what I love about learning web development — every new concept makes the previous ones make more sense. One concept at a time. One day at a time. Are you learning React? What concept made things finally click for you? Let me know in the comments! #reactjs #reactrouter #webdevelopment #javascript #frontenddeveloper #100daysofcode #devjourney #programminghamlet

If your React app “feels slow” but Lighthouse looks fine, the bottleneck is usually inside your render loop. 🧠⚡ In large-scale apps, performance issues often come from a few repeat offenders: 🔁 Unstable props: inline objects/functions causing child re-renders 🧩 Over-wide state: a tiny change triggers a whole tree 📦 Heavy lists: rendering 5k rows when the user sees 20 🕵️ Accidental work: expensive selectors/formatting done every render My debugging flow: 1) React DevTools Profiler: record a real interaction, sort by “self time” ⏱️ 2) Find “why did this render?”: check prop identity + state ownership 🔍 3) Fix the source, not the symptom: - memo/useMemo/useCallback only after you prove churn - split state by concern; colocate state closer to where it’s used - virtualize long lists; defer non-critical UI with transitions - move expensive computations to memoized selectors or the server Real-world impact: these fixes cut CPU + battery drain on mobile, stabilize dashboards, and reduce infra costs when Next.js pages stop re-rendering on every keystroke. 📉📱 What’s your most common React perf culprit lately? 👇 #react #nextjs #javascript #webperformance #frontend

Your React app isn’t slow because of React. It’s slow because of unnecessary work. Here’s what that actually means 👇 Every render has a cost. And most apps are doing more work than required: ✖ Parent re-renders triggering full subtree updates ✖ Expensive calculations running on every render ✖ Large lists rendered without control ✖ State placed too high in the tree What I focus on instead: ✔ Keep state as close as possible to usage ✔ Control re-render boundaries (not blindly memoizing) ✔ Avoid recalculations unless necessary ✔ Measure before optimizing (React Profiler) Real insight: Performance issues are rarely one big problem. They’re small inefficiencies repeated at scale. Fix the flow → performance improves naturally. That’s how you build systems that feel fast. #ReactJS #WebPerformance #Frontend #JavaScript #SoftwareEngineering #Optimization

Your React app is slow because of THESE mistakes 👇 After working on multiple production apps, I’ve seen the same issues again and again: Unnecessary re-renders → Components re-rendering without need → Fix: React.memo, useCallback, useMemo (when needed) Poor state management → Everything in global state → Fix: Split state smartly (server vs client) Large component files → 500+ lines = impossible to maintain → Fix: Break into reusable components API calls everywhere → No central logic → Fix: Use React Query / custom hooks Ignoring lazy loading → Huge bundle size → Fix: React.lazy + code splitting In one project, just fixing re-renders improved performance significantly 🚀 Most devs think performance = backend issue. It’s not. Frontend matters more than you think. Want a checklist to optimize your React app? Comment “React” — I’ll share it. #ReactJS #WebPerformance #Frontend #JavaScript #SoftwareEngineering

Stop Crashing Your Node.js App — Handle Errors Properly Unhandled errors will kill your app. Here’s my pattern: 1. Async/Await with try/catch try { const data = await fetchData(); res.json(data); } catch (error) { console.error(error); res.status(500).json({ error: "Something went wrong" }); } 2. Global error handler app.use((err, req, res, next) => { console.error(err.stack); res.status(500).json({ error: "Server error" }); }); 3. Unhandled rejection listener javascript process.on("unhandledRejection", (reason, promise) => { console.error("Unhandled Rejection:", reason); }); What’s your error handling strategy? #NodeJS #ErrorHandling #BackendDeveloper #JavaScript #WebDev

🚀 Mastering React Performance: Tips Every Developer Should Know React is powerful—but if not optimized properly, your app can slow down fast. Here are some practical tips to boost performance and write cleaner, faster React apps: ⚡ 1. Use React.memo wisely Prevent unnecessary re-renders by memoizing components that don’t need frequent updates. ⚡ 2. Optimize with useCallback & useMemo Avoid recreating functions and heavy calculations on every render. ⚡ 3. Code Splitting (Lazy Loading) Load components only when needed using React.lazy() and Suspense to improve initial load time. ⚡ 4. Key Props Matter Always use stable and unique keys in lists to help React efficiently update the DOM. ⚡ 5. Avoid Inline Functions in JSX They create new instances every render—can impact performance in larger apps. ⚡ 6. Virtualize Large Lists Use libraries like react-window to render only visible items. 💡 Performance isn’t just optimization—it’s about delivering a smooth user experience. What’s your go-to trick for optimizing React apps? 👇 #ReactJS #FrontendDevelopment #WebDevelopment #Java

🚀 Stop re-rendering your entire React app — here's why it's hurting you. One of the most common mistakes I see in React codebases is placing state too high in the component tree. When state lives at the top, every tiny update triggers a cascade of re-renders — even for components that don't care about that change. Here's what I do instead: ✅ Co-locate state — keep state as close to where it's used as possible. ✅ Use React.memo wisely — memoize components that receive stable props. ✅ Split context — separate frequently changing data from static config. ✅ Reach for useMemo & useCallback — but only when profiling confirms it helps. The result? A snappier UI, cleaner architecture, and fewer mysterious bugs. The React team built these tools for a reason — it's just about knowing when and where to apply them. 💬 What's your go-to trick for keeping React apps performant? Drop it in the comments — I'd love to learn from you! #React #WebDevelopment #Frontend #JavaScript #SoftwareEngineering

Why your React app re-renders 3x more than it needs to? Most React apps re-render far more than necessary. Here's what's actually happening — and how to fix it. React re-renders a component when: → Its state changes → Its parent re-renders → A context it consumes updates The fix isn't always useMemo or useCallback. Overusing them adds overhead. Here's the real hierarchy: 1. Fix component composition first — lift state down, not up 2. Memoize expensive computations with useMemo 3. Stabilize callbacks with useCallback only when passing to memoized children 4. Use React.memo as the last resort — not the first The key insight: React.memo only helps when props are referentially stable. If you're creating new objects or arrays inline in JSX, memo does nothing. A common culprit: <Component config={{ key: 'value' }} /> ← new object every render Fix: define config outside the component or memoize it. Profiling tip: use React DevTools Profiler to see what's actually re-rendering before optimizing. Don't guess. #ReactJS #Frontend #WebPerformance #JavaScript #SoftwareEngineering

⚛️ Learning React Hooks - useState I recently explored one of the core concepts of React — Hooks (useState) — and applied it by building a simple Counter App. Here’s what I implemented: ✔️ Managed state using useState ✔️ Built increment & decrement functionality ✔️ Added boundary conditions (0 to 20 limit) ✔️ Understood how React re-renders on state updates Code snippet: let [counter, setCounter] = useState(0); const addValue = () => { setCounter(counter + 1); }; const removeValue = () => { setCounter(counter - 1); }; 💡 This project helped me clearly understand how state works in React and why hooks are so powerful for building interactive UIs. #ReactJS #JavaScript #WebDevelopment #FrontendDevelopment #ReactHooks #LearningInPublic