Devanand Borhade’s Post

🚨 Your React app is slow… and it’s probably because of this one mistake. Unnecessary re-renders. React is fast. But if your components keep re-rendering without need, your UI will feel slow especially in tables, lists, and complex dashboards. Here’s how to fix it (the right way): 1️⃣ React.memo Prevents a component from re-rendering when props haven’t changed. Use it for: • List items • Table rows • Heavy UI components 2️⃣ useCallback Keeps function references stable. Use it when: • Passing functions to memoized child components • Avoiding child re-renders caused by new function references 3️⃣ useMemo Caches expensive calculations. Use it for: • Filtering/sorting large data • Derived values from heavy computations ⚠️ Common mistake: Using memoization everywhere. Overusing React.memo, useCallback, or useMemo can actually hurt performance due to extra memory and comparison overhead. 👉 Rule of thumb: Measure first (React DevTools Profiler) → Optimize only where needed. In one of my projects, optimizing unnecessary re-renders in a large table reduced renders by ~40% and made the UI much smoother. #ReactJS #JavaScript #FrontendDevelopment #WebPerformance #ReactPerformance #SoftwareDevelopment #CodingTips #DevCommunity

Want to level up your React skills by building something real? I just published a step‑by‑step guide on building a complete task tracker using React Hooks — perfect for sharpening your frontend fundamentals and getting hands‑on with real code. https://lnkd.in/gDazsSgJ In the article you’ll find: - How to structure your app with hooks - Practical examples of useState, useEffect, and more - Tips for clean, scalable React code Whether you’re just starting with React or looking for a solid project to build your portfolio, this tutorial walks you through it clearly and practically. What’s one feature you’d add to your own task tracker? #ReactJS #WebDevelopment #Frontend #JavaScript #ReactHooks #CodingProject #webdevelopment #tutorial

📦 Handling Large Lists Efficiently in React Native Because smooth scrolling = great user experience. Large lists (feeds, products, chats, notifications) can easily make your app laggy if not handled properly. Here’s how to optimize them like a pro 👇 🚀 1️⃣ Always Use FlatList (Not ScrollView) ScrollView renders everything at once ❌ FlatList renders items lazily (only what’s visible) ✅ Virtualization = better performance. ⚡ 2️⃣ Optimize Rendering Props Tune these props based on your use case: initialNumToRender maxToRenderPerBatch windowSize removeClippedSubviews Defaults are not always optimal for production apps. 🧠 3️⃣ Memoize List Items Wrap list items with React.memo to avoid unnecessary re-renders. Large lists + frequent state updates = performance issues Memoization reduces wasted renders. 📏 4️⃣ Use getItemLayout (If Item Height is Fixed) If your list items have fixed height, define getItemLayout. This avoids runtime layout calculations and improves scroll performance. 🖼️ 5️⃣ Optimize Images Inside Lists Heavy images inside lists slow everything down. Resize images properly Use caching Avoid loading full-resolution images 🔄 6️⃣ Avoid Inline Functions in renderItem Inline arrow functions can trigger re-renders. Instead: Define functions outside render Use useCallback Small improvement. Big difference at scale. 🎯 7️⃣ Consider Pagination or Infinite Scroll Don’t load 1000 items at once. Implement: Lazy loading Infinite scroll API pagination Scalability matters. 🧠 Final Thought Performance problems don’t appear in development. They appear in production — with real users and real data. Optimize before users complain. #ReactNative #MobileDevelopment #AppPerformance #FlatList #JavaScript #JS #FrontendDevelopment #ScalableApps #DeveloperTips #Developers

After First Render — What Happens Next in a React App? In my previous post, we followed the journey from: npm run dev → browser request → React render → first paint. But the story doesn't end there. Once your React app appears on the screen, React starts doing its real job: managing UI updates efficiently. Let’s see what happens next. Step 1 — Component Initialization When React renders <App />, it doesn’t just render one component. It creates a component tree: App → Header → Sidebar → Dashboard → Button → Card Each component becomes part of React’s internal structure called the Fiber Tree. This tree helps React track: • component state • props • updates • rendering priority Step 2 — State and Props Drive the UI React UI is driven by two things: Props Data passed from parent → child. State Data managed inside a component. Example: const [count, setCount] = useState(0) Whenever state changes, React schedules an update. React doesn't directly change the DOM. Instead it triggers a re-render process. Step 3 — Re-render Trigger A re-render can happen when: • State changes • Props change • Context changes • Parent component re-renders Example: setCount(count + 1) This tells React: "Something changed — update the UI." Step 4 — Virtual DOM Diffing React now creates a new Virtual DOM snapshot. Then it compares: Previous Virtual DOM vs New Virtual DOM This process is called Diffing. React identifies only what actually changed. Example: If only a <span> text changed, React updates only that node — not the entire page. Step 5 — Efficient DOM Update (Reconciliation) After detecting changes, React performs Reconciliation. It updates only the necessary parts of the real DOM. This is why React apps remain fast even with large UI trees. The Continuous React Loop React constantly runs this cycle: State Change ↓ Re-render ↓ Virtual DOM Diff ↓ DOM Update ↓ Browser Paint This loop keeps your UI reactive and efficient. Why This Matters Understanding this flow helps you: • avoid unnecessary re-renders • optimize performance • write better React code • debug UI issues faster React isn’t just rendering components. It’s running a highly optimized UI update engine behind the scenes. #SoftwareEngineering #WebDevelopment #FrontendDevelopment #Programming #Coding #ReactJS #JavaScript #ViteJS #FrontendEngineer #ReactDeveloper #LearnToCode #DevCommunity

Your React app feels slow? Before blaming React… check your rendering logic. Performance issues in React usually happen because of 👉 unnecessary re-renders 👉 heavy computations 👉 poor component structure Let’s talk about how to optimize it properly. 🔹 How Do You Optimize React Performance? Here are the most practical techniques I’ve used: ✅ Memoization React.memo → Prevents unnecessary component re-renders useMemo → Caches expensive computed values useCallback → Prevents function recreation ✅ Lazy Loading Load components only when needed using React.lazy() Improves initial page load time ✅ Proper Keys in Lists Always use unique, stable keys Prevents unnecessary re-rendering of list items ✅ Avoid Unnecessary State Keep state minimal Don’t store derived values if you can compute them ✅ Code Splitting Split large bundles into smaller chunks 🏢 Real-Time Example In a dashboard project with large data tables, the UI started lagging when filters changed. I optimized it by: • Wrapping components with React.memo • Using useMemo for heavy filtering logic • Using proper keys for table rows Result: ⚡ Faster rendering ⚡ Smooth filtering ⚡ Better user experience 📌 Interview Tip: Don’t just say “use memoization.” Explain why re-renders happen and how your solution prevents them. Optimization isn’t about adding Hooks everywhere. It’s about understanding React’s rendering behavior. Next: I’ll explain React.memo in depth. If you’re serious about building scalable React apps, stay connected 🚀 Saurav Singh #ReactJS #FrontendDevelopment #JavaScript #ReactPerformance #ReactDeveloper #LearningInPublic 🚀

𝐈𝐬 𝐲𝐨𝐮𝐫 𝐑𝐞𝐚𝐜𝐭 𝐚𝐩𝐩 𝐫𝐞-𝐫𝐞𝐧𝐝𝐞𝐫𝐢𝐧𝐠 𝐦𝐨𝐫𝐞 𝐭𝐡𝐚𝐧 𝐢𝐭 𝐧𝐞𝐞𝐝𝐬 𝐭𝐨, 𝐞𝐯𝐞𝐧 𝐰𝐡𝐞𝐧 𝐲𝐨𝐮 𝐭𝐡𝐢𝐧𝐤 𝐲𝐨𝐮'𝐯𝐞 𝐦𝐞𝐦𝐨𝐢𝐳𝐞𝐝 𝐞𝐯𝐞𝐫𝐲𝐭𝐡𝐢𝐧𝐠? I recently battled a subtle performance snag in a Next.js dashboard. We had a component rendering a complex analytics table, and even with React.memo on the table itself, scroll performance was rough. The issue? We were constructing a processedData array directly in the parent component's render function before passing it down as a prop. ```javascript const MyParent = ({ rawData, filters }) => { // This creates a *new* array reference on every render const processedData = processAndFilter(rawData, filters); return <MemoizedTable data={processedData} />; }; ``` Even if rawData and filters didn't change, processedData was a brand new array reference on every parent re-render. This completely bypassed React.memo on MemoizedTable because its data prop was technically always "new." The fix was a classic useMemo: ```javascript const MyParent = ({ rawData, filters }) => { const processedData = useMemo(() => { return processAndFilter(rawData, filters); }, [rawData, filters]); // Re-compute only when these change return <MemoizedTable data={processedData} />; }; ``` This ensured processedData kept the same reference as long as rawData and filters were stable, finally letting React.memo work its magic. Small tweak, massive improvement in responsiveness! Have you ever found a hidden re-render pitfall like this? What's your go-to React performance optimization? #React #FrontendDevelopment #PerformanceOptimization #JavaScript #WebDevelopment

Topic: React Error Boundaries – Handling Crashes Gracefully 🛑 React Error Boundaries – Because Apps Shouldn’t Crash Completely No matter how well you code, errors in production are inevitable. But should one broken component crash the entire app? ❌ No. That’s why we have Error Boundaries. 🔹 What Are Error Boundaries? Special React components that catch JavaScript errors in their child component tree. ✔ Prevent full app crash ✔ Show fallback UI ✔ Improve user experience 🔹 Where They Work ✅ Rendering errors ✅ Lifecycle method errors ❌ NOT for event handlers ❌ NOT for async code 🔹 Basic Example class ErrorBoundary extends React.Component { state = { hasError: false }; static getDerivedStateFromError() { return { hasError: true }; } render() { if (this.state.hasError) return <h1>Something went wrong</h1>; return this.props.children; } } 💡 Real-World Use Wrap risky components like: 👉 Payment forms 👉 Dashboards 👉 External integrations 📌 Production apps aren’t error-free. They’re error-tolerant. 📸 Daily React tips & visuals: 👉 https://lnkd.in/g7QgUPWX 💬 Have you implemented Error Boundaries in your projects? 👍 Like | 🔁 Repost | 💭 Comment #React #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #ErrorHandling #DeveloperLife