6 Common React Performance Issues and How to Fix Them

🚀 REDUX — Manage State. Simplify Complexity. State management can become messy as applications grow. That’s where Redux helps by providing a predictable and centralized way to manage your app’s state. 💡 What is Redux? Redux is a state management library for JavaScript applications (commonly used with React). Think of it as a single source of truth (store) for your entire app. ⚙️ How Redux Works: 1️⃣ Store → Holds the complete state 2️⃣ Actions → Describe what happened 3️⃣ Reducers → Decide how state changes 4️⃣ Dispatch → Sends actions to update state 📌 Example Flow: User logs in → Action dispatched → Reducer updates state → UI updates automatically 🔥 Why use Redux? ✔️ Predictable state management ✔️ Easier debugging ✔️ Scales for large applications ✔️ Cleaner architecture 💡 Pro Tip: Use Redux Toolkit to reduce boilerplate and speed up development. 💬 I love discussing React, Redux, and frontend best practices. Let’s connect and grow together! #Redux #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #ReduxToolkit #SoftwareDeveloper #Learning #Tech

Handling a single Promise is easy. Handling multiple Promises correctly is where things get interesting. In real-world apps, we often need to: • Wait for everything to complete • Pick the first successful result • React to the fastest response • Or simply collect all outcomes That’s exactly what Promise combinators solve. In my latest blog, I’ve explained: • Promise.all • Promise.any • Promise.race • Promise.allSettled Using a simple and relatable wedding planning analogy 💍 The goal was simple — make async logic feel intuitive, not intimidating. If you’ve ever been confused about these methods, this will help. Read here 👇 https://lnkd.in/gtcRWS5E Would love your feedback! #JavaScript #WebDevelopment #AsyncProgramming #Frontend

Excited to share my latest project — an interactive Family Tree Web App 🌳 🔗 Live Demo: https://lnkd.in/ga_4Bvy4 Built this to visualize family relationships in a simple and intuitive way using modern web technologies. It was a great exercise in working with hierarchical data structures, recursion, and clean UI design. Would love your feedback and suggestions! #WebDevelopment #ReactJS #JavaScript #FrontendDeveloper #DataStructures #FamilyTree #OpenSource #100DaysOfCode

I deleted 70% of useEffect calls in a production React app. Nothing broke actually it became faster. The real problem wasn't "too many effects" it was derived state computed inside effects instead of during render. Context: A dashboard with filters, sorting, and real-time updates. Each filter change triggered useEffect → setState → re-render → another useEffect classical chain reaction. What I did instead: Moved all derived data into useMemo + selector functions. Used event handlers for user actions (filters, sorting). Kept useEffect only for external sync (localStorage, analytics, WebSocket). Rule I now use: If you setState inside useEffect - stop. Ask can this be calculated during render? Result: 7 effects --> 2 effects Rerenders per filter change: from 4 --> 1 Bug: impossible (no more stale closure issues) The shift in thinking: React is not reactive like Vue or Svelte. it's declarative. State --> UI. Effects are escape hatches, not data flow tools Question for you: What is the most confusing useEffect bug you've ever debugged? #react #typeScript #frontendperformance

🎯 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

Along with the search filter, I built a simple notes app. The idea was straightforward: type something → save it → keep it even after refresh. It mainly involved: • capturing user input • updating the UI dynamically • storing data in localStorage • retrieving it back on reload Nothing complex, but it tied together multiple concepts in a practical way. Seeing data persist made the whole flow feel closer to a real application. #javascript #webdevelopment #frontend

Most React apps are slow — not because of React, but because of poor architecture. In one of our recent projects, we improved performance by ~40% just by: • Implementing code splitting • Using lazy loading • Avoiding unnecessary re-renders The biggest mistake I see: Developers treat performance as a “fix later” problem. It’s not. Performance is an architecture decision. What’s one performance mistake you’ve seen in React apps?

🧠 Most React apps scale fine at the start, Until state becomes messy, unpredictable, and hard to manage. 👉 Read the full guide 🔗 📌 What you’ll learn: https://shorturl.at/jtKRp ➥ Why poor state design is the biggest bottleneck in scaling React apps ➥ How to separate UI state vs server state effectively ➥ When to use local state, context or state libraries ➥ Patterns to avoid prop drilling and unnecessary re-renders ➥ Practical strategies to build clean, scalable state systems ✨✍ Written by: Harsh Chauhan #ReactJS #StateManagement #FrontendArchitecture #WebDevelopment #JavaScript #ScalableSystems #Engineering

How I Structure My React Projects ⚛️ Clean structure = scalable app. Here’s the folder setup I use in most projects 👇 📁 𝘀𝗿𝗰/ ├── 📁 components/ → Reusable UI components ├── 📁 pages/ → Page-level components ├── 📁 hooks/ → Custom React hooks ├── 📁 services/ → API calls & logic ├── 📁 utils/ → Helper functions ├── 📁 assets/ → Images, icons, styles ├── 📁 context/ → Global state (if needed) ├── 📁 routes/ → Routing setup 💡 Key principles: ✅ Keep components small & reusable ✅ Separate logic from UI ✅ Avoid deep nesting ✅ Group by feature when scaling Bad structure slows teams. Good structure scales projects. How do you organize your React apps? #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment

Server Components in Next.js are one of those features that quietly change how you build. For years, React apps leaned heavily on client-side fetching, loading states, and shipping lots of JS to the browser. With Server Components, you can move a big part of that work back to the server by default. Why this matters: 1. Less JavaScript sent to users 2. Faster initial loads 3. Direct access to backend resources on the server 4. Cleaner separation between interactive UI and data-heavy UI What clicked for me: 1. Treat Server Components as the default 2. Add Client Components only where interactivity is needed 3. Keep data fetching close to where data is rendered 4. Stream UI progressively with Suspense for better perceived performance A practical mindset shift: You are not choosing between SSR and CSR page-by-page anymore. You are composing both in the same tree, component-by-component. Result: Better performance without turning your app architecture into a workaround maze. If you are building with Next.js App Router and still defaulting everything to use client, it is worth revisiting that decision. How are you deciding what stays on the server vs what moves to the client? #react #nextjs #SSR