Harsh Marthak’s Post

I stopped guessing… and started measuring my React app For a long time, I thought I knew why my React app was slow. ❌ Maybe too many re-renders ❌ Maybe React is inefficient ❌ Maybe my code is bad ------------------------------------- But the truth? 👉 I was guessing… not measuring. ⚡ Then I discovered the real game changer: Profiling Instead of assumptions, I started using: • React DevTools Profiler • Chrome Performance tab ------------------------------------- And suddenly, everything became clear 👇 🔍 What I found: • Components re-rendering unnecessarily • Expensive calculations running on every render • Large lists blocking the UI • State updates triggering deep component trees ------------------------------------- 💡 Fixes I applied: ✅ Memoized components using React.memo ✅ Used useMemo for heavy computations ✅ Used useCallback to avoid unnecessary function recreation ✅ Split large components into smaller ones ✅ Virtualized long lists ------------------------------------- 🚀 The result: Not just “slightly better”… 👉 The app became noticeably faster and smoother 🎯 Biggest lesson: Performance issues are not solved by guessing They are solved by measuring #reactjs #reactdeveloper #seniorfrontend #frontendengineering #javascript  #webperformance #reactperformance #frontendarchitecture #softwareengineering  #webdevelopment #performanceoptimization #cleancode #scalablecode #devtools #profiling #engineeringlife #techlead #frontenddev  #softwaredeveloper #codingbestpractices #uilayer #webperf #performancematters

🔴90% of React applications have performance issues... and most developers don't even realize it. that might sound surprising but it's true. React is fast but it isn't automatically optimized. optimization is your responsibility. so what actually makes a React app slow? the reasons vary but the root cause is almost always the same: unnecessary re-renders. React's main task is to make sure your UI is up to date with your state and when your state changes, it should update the UI. That's normal, right? That's React doing its job. The problem is when it updates UI components that weren't even affected by the state change. think about it You have a parent component with state and inside it, there are 10 child components and only one of them was affected by your state change. But React? it re-renders all 10 of them that's exactly where performance dies. 📌So what actually solves this problem? 🔸React.Memo: it's like saying to React, "Hey, man, only update this component if its own props changed." 🔸useMemo: to remember results of heavy computations, so it doesn't compute it every time it renders۔ 🔸useCallback: to stop functions from being recreated, which would then make your child components re-render. but❗ and this is an important but don't use these tools blindly... first, use React DevTools Profiler to see if it's actually an issue۔ and then optimize۔ optimizing prematurely is like adding complexity without any real benefit. the secret to React performance is simple: move your state to the right place, and only update what needs updating🚀 how do you measure performance in your React applications? 👇 #ReactJS #WebDevelopment #MERNStack #JavaScript #Frontend #Performance #SoftwareEngineering #CodingTips #TechCommunity

⚛️ React works with ⚡ Vite in a modern frontend setup. Earlier, I thought building React apps always required heavy bundling and slow refresh. But Vite changes that completely by using native ES modules. Instead of bundling everything at the start, Vite loads only what is needed — making development much faster and smoother. What I understood from this architecture: • ⚡ Instant dev server startup (no waiting time) • 🔁 Hot Module Replacement (see changes instantly without reload) • 🧩 Clear flow: index.html → main.jsx → App.jsx → components • 🧠 Easy-to-manage component-based structure • 📦 Optimized production build with better performance For beginners, this kind of setup reduces confusion and improves learning speed. For developers, it improves productivity and code quality. Understanding tools like Vite is not just about speed — it’s about writing better, scalable frontend applications. 🚀 #React #Vite #FrontendDevelopment #Learning #WebDevelopment #JavaScript

Most React developers are writing useEffect wrong. Not because they don't understand it. Because they think they do. After 3 years of building React apps here's what I've learned the hard way: ❌ You don't need useEffect to derive state. ❌ You don't need useEffect to sync two pieces of state. ❌ You definitely don't need useEffect to handle a user event. useEffect is for syncing React with something OUTSIDE React. That's it. That's the rule. When I first started, I put everything in useEffect. Fetch calls. Transformations. Even click handler logic. The bugs were subtle. The re-renders were endless. And the codebase became a nightmare to debug. The fix? Think before you reach for it. Ask yourself: "Am I escaping React, or am I fighting it?" If you're fighting it — useMemo, useCallback, or plain derived variables will serve you better. React is not hard. But undisciplined useEffect usage will make it feel that way. Drop a 🔁 if you've fallen into this trap before. And follow for more no-fluff React breakdowns 👇 #ReactJS #FrontendDevelopment #JavaScript #WebDev #ReactHooks #SoftwareEngineering

I used to think I understood React… until I had to pass the same state through 3–4 components just to control one small thing 😅 It worked, but it didn’t feel right. So instead of jumping to another tutorial, I tried to actually "understand the problem" and that led me to the Context API. To keep things simple, I built a tiny “bulb toggle” app 💡 At first, everything was prop-based. Then I switched to Context… and the difference was obvious. Now: 1. I’m not passing props through unnecessary layers 2. Components feel more independent 3. The code is easier to read and reason about But I also learned something important while doing this: 👉 Context is helpful, but it’s not a replacement for everything If the state is simple and only needed in a few places, props are still totally fine. Context starts to make sense when multiple parts of your app need the same data. Still early in my journey, but this was one of those small moments where things started to click. If you’ve worked with Context before -> 👉 how do you decide between props, Context, or other state tools? #learninginpublic #reactjs #webdevelopment #javascript #frontenddevelopment

React taught me something no tutorial ever will… Users don’t care how complex your app is. They only care if it works smoothly. They won’t see: the state you managed across 5 components the Redux logic keeping everything in sync the hours spent fixing one tiny bug the edge cases you handled silently If everything works perfectly… 👉 they notice nothing. And that’s the goal. Because in frontend, a seamless UI is just hundreds of invisible problems solved. Not gonna lie — it can feel underrated sometimes. But there’s a different kind of satisfaction in knowing: You turned messy logic into something simple for the user. That’s real development. Frontend devs — what’s something you’ve fixed that no one will ever notice? 👇 #ReactJS #Redux #FrontendDeveloper #DeveloperLife #BuildInPublic #CodingJourney #ReactJS #Redux #FrontendDevelopment #DeveloperLife #BuildInPublic #TechCareers #SoftwareDeveloper

🚀 Just built a Task Manager App using React! ✨ Features: ✔ Add, Edit, Delete Tasks ✔ Mark Complete ✔ Filter (All / Completed / Pending) ✔ LocalStorage (data persists after refresh) ✔ Clear All Tasks 🔗 Live Demo: https://lnkd.in/gk6PWB2e 💻 GitHub: https://lnkd.in/gR-cHfQP This project helped me understand: React state management CRUD operations Real-world UI logic More improvements coming soon 🚀 #React #WebDevelopment #Frontend #JavaScript #Coding

Hello everyone, Ever noticed how React apps look amazing… until loading kicks in? That “meh” fallback UI always felt off to me. While building with React Suspense, I kept running into the same issue: every time the UI changed, I had to rewire fallbacks in multiple places. It felt fragile. Repetitive. And honestly, a waste of time. So I dug into why. The problem wasn’t Suspense itself. It was where we define fallbacks. 👉 Today: parents control fallbacks 👉 But in reality: loading belongs to the component So I built AutoSuspense. A small React DX library where: • Components declare their own fallback • No manual wiring in parents • The fallback UI is automatically composed Example: <AutoSuspense> <Profile> <Posts /> <Sidebar /> </Profile> </AutoSuspense> Each component declares its own loading: export default Suspend(Profile, <ProfileSkeleton>{children}</ProfileSkeleton>); export default Suspend(Posts, <PostsSkeleton />); export default Suspend(Sidebar, <SidebarSkeleton />); And instead of separate loaders… It builds a single fallback tree: <ProfileSkeleton> <PostsSkeleton /> <SidebarSkeleton /> </ProfileSkeleton> No rewiring. No duplication. No structure headaches. Just: Components declare loading => AutoSuspense builds the tree Also supports fallback mapping for scale: <AutoSuspense fallbacks={{ profile: <Skeleton /> }}> <Child /> </AutoSuspense> export default Suspend(Component, "profile"); If you're curious, check it out: 🔗 https://lnkd.in/ggRmu_kE Still exploring where this pattern can go. Would love feedback. 👀 #react #javascript #frontend #opensource #webdev

⚛️ Zustand — A Clean & Minimal Approach to State Management in React When building applications with React, one thing that really impacts code quality over time is how you manage state. There are plenty of options out there, but Zustand stands out for keeping things simple without sacrificing flexibility. 🧠 What is Zustand? Zustand is a lightweight state management library that lets you manage global state with very little setup. 👉 No providers 👉 No reducers 👉 No heavy boilerplate It keeps things straightforward and easy to reason about. ⚡ How it works At its core, Zustand is just a simple store: import { create } from "zustand"; const useStore = create((set) => ({ count: 0, increment: () => set((state) => ({ count: state.count + 1 })), })); And you can use it anywhere in your app: const count = useStore((state) => state.count); const increment = useStore((state) => state.increment); No extra wrapping or complex setup needed. 🔥 Why Zustand works well ✔ Clean and minimal API ✔ Updates only what actually changes (better performance) ✔ No need to wrap your entire app ✔ Helps you move faster with less code ⚠️ Where to be cautious Zustand is great, but it’s not a one-size-fits-all solution. 👉 For large-scale apps with complex workflows 👉 When you need strict structure or advanced debugging tools you might want something more opinionated. 💡 Practical perspective Zustand fits really well when: ✔ Your app is small to medium in size ✔ You want to keep things simple ✔ You don’t need heavy state architecture 🚀 Final thought State management doesn’t have to be complicated. Sometimes, keeping things simple is the best decision you can make for your codebase. ❓ What are you using in your projects — Redux or Zustand? 📌 I’ll share a detailed comparison of Redux vs Zustand in my next post. #reactjs #zustand #redux #frontenddevelopment #javascript #webdevelopment #softwareengineering #fullstackdeveloper #dotnetfullstackdeveloper #react

🚀 I thought I was optimizing my React app… but I was actually wasting time 😅 In my React projects, I used to spend a lot of time on performance optimization: 🔹 "useMemo" 🔹 "useCallback" 🔹 "React.memo" I thought this was the “right way”. But recently, I learned about the React Compiler. It can automatically handle many optimizations that we used to do manually. That made me realize… 👉 I was spending too much time optimizing things that React can handle for me. --- 🔹 What I learned React is evolving. With the compiler: 👉 Many unnecessary re-renders can be optimized automatically 👉 Less need for manual memoization in many cases But this doesn’t mean we stop thinking as developers. --- 🔹 What still matters We still need to focus on: 👉 Code splitting 👉 Lazy loading 👉 Following React best practices 👉 Writing clean and predictable components And most importantly: 👉 Following React rules properly --- 🔹 Reality check The React Compiler is still evolving and improving, so it’s important to understand where it helps and where manual optimization is still needed. So we should: 👉 Understand optimization concepts 👉 Use tools like React DevTools to analyze performance 👉 Apply manual optimization only when needed --- 💡 My takeaway 👉 Don’t over-optimize early 👉 Understand the problem first 👉 Keep learning and stay updated Because in tech: 👉 What worked yesterday may change today Still learning and improving 💻 How do you approach performance optimization in React? 👇 #ReactJS #FrontendDevelopment #WebDevelopment #PerformanceOptimization #JavaScript #LearningJourney #DeveloperMindset