What is React StrictMode and how to use it

I almost shipped a slow React app. Not broken. Not buggy. Just… slow. Everything worked. But something felt off — clicks felt delayed, UI had that subtle lag that users notice even if they can't explain it. I opened React DevTools Profiler and what I saw genuinely surprised me. One small interaction was triggering re-renders across components that had absolutely nothing to do with it. Functions being recreated on every render. Child components updating for no reason. I wasn't writing bad code. I just didn't understand what React was actually doing under the hood. Three things that changed everything for me: React.memo — child components stopped re-rendering unless their props actually changed useCallback — function references stayed stable between renders instead of being recreated every time useMemo — expensive calculations stopped running on every single render The difference was immediate. The app felt alive in a way it didn't before. No library. No major refactor. Just understanding how React works and using the tools it already gives you. If your React app feels sluggish and you haven't opened the Profiler yet — that's your next 30 minutes sorted. #ReactJS #Frontend #JavaScript #WebDevelopment #Programming

🎯 Have you ever felt your React app was re-rendering more than it should… and you didn’t realize it? Everything looked fine But under the hood → unnecessary UI updates were killing performance 😵💫 Then I learned this 👇 👉 React doesn’t care if your UI “looks same” 👉 If state/props change → it re-renders 💡 The real problem: Global state (like Context API) → triggers re-renders everywhere Components update even when their data didn’t change This is the core issue behind unnecessary UI updates 🧠 What helped me fix it: ⚡ Context Splitting → Break global state into smaller pieces 🎯 Selectors → Subscribe only to specific state (not entire context) 🧩 Memoization → Use React.memo, useMemo, useCallback to avoid useless recalculations 🔥 The mindset shift: 👉 “Not every re-render is bad… but unnecessary ones are expensive.” Since understanding this: My UI feels smoother Debugging became easier I started thinking like a performance-focused developer If you're working with React, this is something you can’t ignore. 💬 Have you ever faced unnecessary re-renders in your app? #ReactJS #FrontendDevelopment #WebPerformance #JavaScript #Coding

🚀 **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

🚨 Stop guessing production bugs. Start seeing them. If you're building modern frontend apps, especially in React, relying on console logs or user complaints is not enough anymore. That’s where Sentry comes in. 💡 What makes Sentry powerful? ✔️ Real-time error tracking ✔️ Detailed stack traces + user context ✔️ Session replay (see what the user actually did!) ✔️ Performance monitoring for slow APIs & renders Instead of: ❌ “User says the app crashed” ❌ “Can’t reproduce the issue” You get: ✅ Exact error + line number ✅ User journey before crash ✅ Environment + device details ⚛️ For React developers Sentry integrates seamlessly with Error Boundaries and gives you visibility into component-level failures. --- 🔥 Real talk: If your app is in production and you’re not using monitoring, you’re basically flying blind. --- 💬 Curious—what tools are you using for error tracking in your frontend apps? #ReactJS #FrontendDevelopment #WebDevelopment #Sentry #Debugging #JavaScript #SoftwareEngineering

🚀 React.memo in the simplest way possible Ever noticed your React app getting slower… even when nothing really changed? 🤔 Here’s a small concept that can make a BIG difference 👇 🧠 What is React.memo? 👉 It simply means: “Don’t re-render a component if its props didn’t change.” 🎨 Real-life example Imagine you drew a house yesterday 🏠 Today… nothing changed. Will you draw it again? ❌ No — waste of time ✅ You keep the old drawing 👉 React.memo does the same thing ⚡ Without React.memo Parent updates ALL child components re-render 😓 ⚡ With React.memo Parent updates ONLY changed components re-render ✅ Others are skipped → faster app 🚀 🎯 One-line takeaway 👉 React.memo = Skip unnecessary work → Better performance 💡 Most beginners ignore this… But this is one of the easiest ways to make your app faster. If this helped you, save it for later 🔖 Follow for more simple dev concepts 🚀 #ReactJS #JavaScript #WebDevelopment #FrontendDevelopment #SoftwareEngineering #Programming #Developers #Coding #Tech #Innovation

⚡ React Performance Optimization Tip Unnecessary re-renders can slow down your React app. Use useMemo to optimize expensive calculations. Benefits: • Reduce re-renders • Cache computed values • Improve performance Performance optimization is one of the most important skills for React developers. Are you using useMemo in your projects? #reactjs #performance #frontenddeveloper #mernstack #javascript #reactdeveloper #webdevelopment #optimization #coding #developers

🚀 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

⚠️ Common React Native Mistakes Developers Still Make After working on multiple production apps, I’ve noticed some common mistakes that can seriously impact performance and user experience 👇 ❌ 1. Unnecessary re-renders Not using useMemo / useCallback properly can slow down your app ❌ 2. Poor state management Messy state = hard-to-maintain and buggy apps ❌ 3. Ignoring performance optimization FlatList without optimization = laggy UI ❌ 4. No proper error handling in APIs Users hate when apps break without feedback ❌ 5. Overusing third-party libraries More dependencies = more problems --- ✅ What I’ve learned: Keep it simple, optimize early, and always think about the user experience Small improvements can make a BIG difference 🚀 --- What’s one mistake you learned the hard way in React Native? 👇 #ReactNative #MobileDevelopment #JavaScript #AppDevelopment #SoftwareEngineering #CodingTips

If your React / Next.js app feels messy, it’s probably not the stack. It’s how you’re using it. I’ve seen this a lot building with React and Next.js: Everything goes into global state… and suddenly small changes break random parts of the app. Data is fetched in multiple places… so when something’s wrong, you don’t even know where to look. Simple components get overloaded with logic… now they’re hard to reuse and harder to debug. Server Components exist, but get ignored… so the app ships way more JS than needed. And sometimes people just fight the framework instead of working with it. React / Next isn’t messy by default. We make it that way. Most of the time, doing less fixes it. Keep things local. Don’t overthink components. Let the framework handle what it’s good at. You’ll feel the difference pretty quickly. #reactjs #nextjs #webdevelopment #softwareengineering #frontend #programming

🚀 Just built a Notes App using React! A simple yet powerful app to create, manage, and organize notes efficiently. This project helped me strengthen my frontend skills and understand real-world component structuring. 🔗 Check it out here: https://lnkd.in/gb38XjAK Would love your feedback and suggestions! 💬 #ReactJS #WebDevelopment #FrontendDevelopment #JavaScript #Coding #Projects #DeveloperJourney