How React Updates the Browser UI Efficiently

⚛️ Common React Mistakes That Are Killing Your Performance 💀 You think your React code is fine… . But these small mistakes are silently breaking your app 👀 Here’s what most developers still do wrong 👇 . ❌ Mutating state directly React won’t re-render properly (page 2)  ❌ Using index as key Leads to weird UI bugs when list updates (page 3)  ❌ Too much global state Unnecessary re-renders & messy logic (page 4)  ❌ useEffect misuse Missing dependency array = infinite loop 🔁 (page 5)  ❌ Storing derived state You’re duplicating logic for no reason (page 6)  ❌ Too many re-renders New objects/functions every render = performance drop (page 7)  ❌ Ignoring loading & error states Your UI breaks when API fails (page 8)  ❌ Poor folder structure Good code needs good organization (page 9)  . 🔥 React isn’t hard… Bad practices make it hard 💬 Clean code = scalable apps 📌 Save this before your next project . More Details Visit: https://lnkd.in/gRVwXCtq Call: 9985396677 | info@ashokit.in. . #ReactJS #Frontend #WebDevelopment #JavaScript #Coding #Developers #Programming #SoftwareEngineering

React gives you tools for state…Zustand gives you a system. That one difference changes everything. 🧱⚙️ 🚨 React vs Zustand — The state management truth no one tells beginners Most developers think React alone is enough for state management… And they’re not wrong. But they’re also not scaling. React helps you build components, Zustand helps you manage your app. 🔖 Save this post & find the list below Follow me: - Parthib M. 🐺 to explore more updates on Web Development. #reactjs #webdevelopment #frontend #javascript #zustand #coding #programming #developers #softwareengineering

Javascript concept: Callbacks Callbacks are simple at first: function greet(fn) { fn(); } But in real-world apps: doA(() => { doB(() => { doC(() => {}); }); }); 😵 This becomes hard to read and maintain. 💡 This problem is called callback hell 🚀 Solution: → Promises → Async/Await #JavaScript #WebDevelopment #Frontend #Coding #LearnToCode

Day 14 - React.memo (Stop Unnecessary Re-renders) One of the biggest reasons React apps become slow is something most developers ignore: Unnecessary re-renders. Even when nothing changes, components keep re-rendering and that directly affects performance. That’s where React.memo helps. What React.memo does: • Prevents re-rendering when props don’t change • Improves performance in large applications • Helps optimize expensive components • Works using shallow comparison of props Simple idea: Without React.memo → Component re-renders every time parent renders With React.memo → Component re-renders only when props change When should you use it? • Large components • Lists with many items • Performance-critical UI parts • Components with expensive calculations Important note: Don’t use React.memo everywhere. Unnecessary memoization can actually hurt performance. Key takeaway: Optimization is not about using every tool it’s about using the right tool at the right place. Next, we’ll dive into useMemo and useCallback and how they help in real-world optimization. #Day14 #ReactJS #Performance #WebDevelopment #Frontend #JavaScript #Developers #Coding #LearningInPublic

Your React app is slow. Here's why. 🐢 Most devs jump straight to optimization tools. But 90% of the time, the fix is simpler: 🔴 Fetching data in every component independently → Lift it up or use a global state solution 🔴 Importing entire libraries for one function → `import _ from 'lodash'` hurts. Use named imports. 🔴 No lazy loading on heavy routes → React.lazy() exists. Use it. 🔴 Images with no defined size → Layout shifts kill perceived performance 🔴 Everything in one giant component → Split it. React re-renders what changed, not what didn't. Performance isn't magic. It's just not making avoidable mistakes. Save this for your next code review. 🔖 #ReactJS #Frontend #WebPerformance #JavaScript #WebDev

Seven things I check first when someone tells «the React Native app is slow». Just the map of where I usually find the actual problem. Half of the 2022 advice doesn't apply anymore: — React Compiler killed manual memoization — New Architecture removed the JS bridge Here's my mental map for 2026 👇 #ReactNative #MobileDevelopment #Performance #JavaScript #TypeScript #Frontend #MobileApps #ReactCompiler

🚀 Leveling up my React skills: Building a Dynamic Quiz App! I just finished building a fully functional Quiz Application, and it was a fantastic deep dive into some of the more nuanced parts of React. What started as a simple UI project turned into a great lesson in state management and component lifecycles. Key things I learned/implemented: ✅ Mastering Effects & Cleanups: I implemented a QuestionTimer using useEffect to handle both a countdown progress bar (via setInterval) and a timeout logic (via setTimeout). Learning to properly clean up these side effects was crucial to avoid memory leaks! ✅ The Power of the key Prop: One of the "aha!" moments was using the key prop to reset component state. By passing key={activeQuestionIndex} to my timer component, I ensured it completely resets and restarts for every new question without complex manual logic. ✅ Optimization with useCallback: To prevent unnecessary re-renders and ensure stable function references for my effects, I utilized useCallback. This was essential for keeping the timer logic precise while passing handler functions down through props. ✅ Derived State: Instead of creating redundant state variables, I practiced deriving the "current question" logic directly from my existing answers array, keeping my state lean and predictable. This project was a great reminder that even "simple" features like a progress bar require a solid understanding of how React handles timing and component instances. Check out the snippet of my QuestionTimer logic below! 👇 #ReactJS #WebDevelopment #Frontend #CodingJourney #JavaScript #ReactHooks #Programming

Most developers use React. Very few understand how it actually works. Under the hood, React doesn’t update the DOM directly every time. It uses something called the Virtual DOM. Here’s the idea: When state changes, React creates a new Virtual DOM. Then it compares it with the previous one. This process is called diffing. After that, React updates only the parts that changed. Not the whole UI. That’s why React apps feel fast. But here’s the real takeaway: React is not “magic”. It’s just smart optimization. And when you understand this, you write better code. You stop: • causing unnecessary re-renders • misusing state • blaming React for performance issues Understanding how things work under the hood is what separates users from engineers. Are you using React… or actually understanding it? #React #FrontendDevelopment #WebDevelopment #JavaScript #SoftwareDeveloper #Programming #DeveloperJourney #LearnToCode #CleanCode

useCallback doesn't actually make your app faster I see devs wrap every callback in useCallback thinking it's a performance  optimization. But here's the truth: The trade-off: - useCallback has overhead (memory + complexity) - Only worth it if child component is wrapped in React.memo() - Most apps don't need it Real performance issues: - Too many DOM nodes (not callbacks) - Inefficient state updates (batching issue) - Expensive computations (use useMemo instead) - Missing keys in lists (array render issue) I spent 2 weeks optimizing callbacks in PulseStack. Removed 80% of them.  Result? No performance change. What changed performance was fixing my  list rendering and state update batching. the lesson i learn is Profile your code before optimizing. Don't optimize blindly. happy to hear your pov 🙂 too ! , i am also here to learn ✨ from you guys . #React #Performance #JavaScript #WebDevelopment #FrontendOptimization

Most React devs bring their SPA habits into Next.js — and their users pay the price. 👇 You've written it a hundred times: useState for data, useEffect to fetch it, a spinner while they wait. It works in React. In Next.js App Router, it's the wrong pattern entirely. Server Components let you fetch data inside the component — on the server, before the page hits the browser. No loading state. No extra JS bundle. No hydration issues. HTML that arrives ready. I've swapped dozens of useEffect fetch patterns for async Server Components and the Lighthouse scores jump immediately. Use the server for reads. Use useEffect for things only the browser can do. #NextJS #ReactJS #WebDevelopment #JavaScript #TypeScript #AppRouter #ServerComponents #ReactHooks #FrontendDeveloper #SoftwareEngineer #CleanCode #100DaysOfCode #WebPerformance #Programming #WebDev #NextJS14 #FullStackDeveloper #CodeQuality