Rajit Ram’s Post

React is slow. At least, that’s what people say when their app starts lagging. But in most cases… React isn’t the problem. Recently, I debugged a performance issue that appeared to be a “React bottleneck”. Turns out 👇 ▪️ Multiple forced reflows & repaints ▪️ Layout thrashing from DOM reads/writes ▪️ Unoptimized rendering triggered by side effects React was just doing its job. The browser was struggling. What actually helped: ✔️ Batching DOM operations properly ✔️ Avoiding layout-triggering CSS changes ✔️ Measuring before mutating (not the other way around) The takeaway: 🏆 If you don’t understand how the browser renders, every framework will feel “slow”. Have you ever blamed React for something that wasn’t actually React? #reactjs #frontend #webperformance #webdevelopment

React is easy to start… But hard to master. At first, it’s just components and props. But then you realize the real game: 👉 State management 👉 Performance optimization 👉 Re-render control A small mistake in structure can slow down your entire app. What I’ve been focusing on: ✔ Writing reusable components ✔ Avoiding unnecessary re-renders ✔ Keeping logic clean and scalable Because good UI isn’t just about looks… It’s about performance + maintainability. #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #UIUX

I thought my React app was slow because of APIs… But the real problem was something else 👇 👉 Unnecessary re-renders Even when nothing visibly changed, React was re-rendering components again and again — slowing down the UI without me realizing it. That’s when I understood the power of: • useMemo • useCallback • React.memo 💡 Biggest lesson: Optimization is not about doing more — it’s about preventing unnecessary work. 📖 Full article link in comments 👇 💬 Have you faced this issue? #reactjs #javascript #frontend #webdevelopment #performance

⚡ Why Most React Apps Feel Slow (And How to Fix It) Many developers think performance issues come from React itself. But in reality — it’s usually how we use it. Here are some common mistakes 👇 🔴 Unnecessary Re-renders Components re-render more than they should. 👉 Use React.memo, useMemo, useCallback wisely. 🔴 Large Component Trees Everything in one component = performance drop. 👉 Split into smaller, reusable components. 🔴 Ignoring Lazy Loading Loading everything at once hurts UX. 👉 Use React.lazy() and dynamic imports. 🔴 Heavy State Management Too much global state = unnecessary updates. 👉 Keep state as local as possible. 🔴 No Virtualization Rendering long lists directly? Big mistake. 👉 Use libraries like react-window. 💡 Performance is not about optimization later — it’s about writing better code from the start. What’s the biggest performance issue you’ve faced in React? 👇 #ReactJS #Frontend #WebDevelopment #JavaScript #Performance

🚀 Just launched: react-state-vitals A zero-config memory & render monitor for React apps. While working on production apps, I kept asking: 👉 Why is this component re-rendering so much? 👉 Which store is growing in memory? 👉 Where is my performance actually going? So I built a tool to make this visible — instantly. 🧠 react-state-vitals gives you a live floating panel in development: • 📊 Store size tracking (Zustand, Context, React Query) • 🔁 Re-render counts per component • 🧬 JS heap usage insights • ⚡ Zero setup — just install and see Think of it as: 👉 “Vitals for your React state & memory” 📦 Try it here: https://lnkd.in/gU692hyT 🔥 Next I’m planning: • DevTools-like overlay • Identify memory-heavy components in real time • Visual performance timeline Would love feedback from fellow devs 🙌 What would you want this to track next? #React #JavaScript #Frontend #WebPerformance #OpenSource #NextJS #Zustand

🚀 I improved my Next.js app performance without adding any new library… Most developers think performance = install more packages. I used to think the same. But recently, while working on a production project, I focused on fixing fundamentals instead of adding complexity 👇 ✅ Reduced unnecessary re-renders ✅ Optimized API calls (no duplicate fetching) ✅ Used proper dynamic imports in Next.js ✅ Cleaned up unused components & heavy logic 📉 Result? - Faster page load - Better Lighthouse score - Smoother user experience 💡 Biggest lesson: Performance is not about tools — it's about understanding your code deeply. Sometimes, the best optimization is removing things, not adding. Curious — what’s one performance mistake you’ve seen developers make often? #reactjs #nextjs #webdevelopment #frontend #performance #javascript

🚀 How I reduced unnecessary re-renders in React (and improved performance) One common issue in React applications is unnecessary re-renders, which can slow down the UI — especially in large-scale apps. Here’s what worked for me: ✅ Used useCallback to memoize functions passed to child components ✅ Used useMemo to cache expensive computations ✅ Wrapped components with React.memo to prevent unnecessary updates ✅ Avoided inline functions and objects in JSX ✅ Optimized component structure to reduce prop changes 📈 Results: • Reduced unnecessary renders • Improved UI responsiveness • Better performance in data-heavy components 💡 Key takeaway: Performance optimization in React is not just about code — it’s about understanding how rendering works. What techniques have you used to optimize React apps? #React #Frontend #WebDevelopment #Performance #JavaScript #NextJS

Day 24/30 — React Journey 🚨 React Developers — You’re Leaving Performance on the Table Want faster apps? Start using memoization today ⚡ Most apps are slow not because of React… but because of unnecessary re-renders. 💡 The fix? 👉 useMemo → cache expensive calculations 👉 useCallback → prevent function re-creation 👉 React.memo → stop useless component re-renders ⚠️ Without this: Every state change = full re-render chain = wasted CPU = laggy UI 🐢 ⚡ With this: Only what changes… re-renders = faster UI = smoother UX = happier users 🔥 Real devs optimize rendering, not just logic. Stop writing React that works… Start writing React that scales 🚀 💬 Comment “MEMO” and I’ll share real-world examples. #ReactJS #WebDevelopment #Frontend #JavaScript #Performance #CodingTips #SoftwareEngineering

🚀 Faced a tricky routing issue while moving from React.js to Next.js — and finally solved it. In React Router, getting dynamic params like: 👉 category 👉 subcategory 👉 brand was super straightforward. But in Next.js App Router, I was only getting: 👉 slug 👉 dynamicRoute This completely broke my product filtering logic. ⚠️ Problem: My API calls were no longer matching the correct category, subcategory, or brand. ✅ What I did: Re-structured route handling logic Normalized params from slug + dynamicRoute Built dynamic API endpoint mapping Optimized fetch calls (no unnecessary re-fetch) 💡 Key Learning: Next.js routing is powerful, but you must rethink how params are handled compared to React Router. 🎥 I made a short video explaining the problem and solution step by step. 🔗 Watch here: https://lnkd.in/gA4zGUFA 💻 Projects: https://lnkd.in/g-jJRjV2 #NextJS #ReactJS #WebDevelopment #Frontend #FullStack #JavaScript #Debugging #MERN #Developers #LearningInPublic

Today everything started to feel… more real. React Masterclass (Day 5). I began with: • Sharing state between components • Passing functions as props • Understanding how React handles state updates But instead of stopping there, I asked: How would this actually work in a real app? 💰 So I built a Budget Tracker: • Set initial balance • Add expenses that reduce it in real-time • Dynamic UI based on current state • Data persisted using localStorage • Clean updates using functional state 💡 Key concepts that clicked: • Lazy initialization (run logic only once) • Functional updates (state based on previous state) • Derived values (calculating remaining balance) Small concepts → Real product thinking. #React #Frontend #WebDevelopment #LearningInPublic #JavaScript