React State Vitals for Memory and Performance Monitoring

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

⚠️ Your React App Isn’t Slow… You’re Just Rendering Too Much. I used to think UI lag was normal as my React projects grew. Turns out — I was wrong. The real problem? 👉 Unnecessary re-renders killing performance. Here’s what I changed: • Used React.memo to stop useless re-renders • Avoided redundant state updates • Fixed messy useEffect dependencies • Broke large components into smaller reusable pieces And the impact? • Faster UI • Better performance • Cleaner codebase Biggest lesson: React doesn’t slow down — poor optimization does. Now I’m more focused on how components render, not just what they render. #reactjs #webdevelopment #mernstack #frontend #performance #javascript

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

🚀 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

Slow frontend apps kill trust. 🛑 Before you rewrite, try these 3 tweaks I use to boost Vue.js performance: 1️⃣ Lazy Loading components 2️⃣ v-once for static content 3️⃣ ShallowRef for large datasets Keep it lean. Keep it fast. ⚡️ #VueJS #WebPerformance #CodingTips

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

🧵 Day 5 of 40 — React System Design Series I used to wrap every function in useCallback. Every. Single. One. I thought that's what senior React devs did. Turns out I was making my app slower, not faster. Here's what I learned about useMemo, useCallback, and React.memo: → Memoisation has a cost — it's not free → The trio only works when all three are used together → The Profiler-first rule: measure before you memoize → Exactly when each one helps (and when it's just noise) Full breakdown with real TypeScript code 👇 https://lnkd.in/g5rcJ7qJ #ReactJS #SystemDesign #Frontend #LearningInPublic #WebDevelopment

⚡ 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

🧠 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

⚛️ Why Your React App Re-Renders Too Much (And How Senior Devs Fix It) One of the biggest performance killers in React apps is unnecessary re-renders… and most developers don’t even realize it. 👉 Common mistakes: ❌ Passing new object/array props on every render ❌ Inline functions inside components ❌ Not using memoization properly Example: Every render creates a new function → child re-renders again 💡 Senior-Level Fix: ✔ useCallback → memoize functions ✔ useMemo → memoize expensive calculations ✔ React.memo → prevent unnecessary re-renders But here’s the catch 👇 Don’t overuse them. ⚡ Rule: “Optimize only when there is a real performance issue.” Blind optimization can make your code worse. 👉 Pro Tip: Use React DevTools Profiler to identify actual re-render problems. Performance is not about writing more code… it’s about writing smarter code. #reactjs #frontend #performance #javascript #webdevelopment #fullstack #softwareengineering #optimization