Optimize React Performance with List Virtualization

Just shipped a fully functional Todo App using React + Vite. Here's a breakdown 👇 📌 What it does: • Add tasks instantly and delete them with a single click • Mark any task as done — strikethrough effect kicks in for a satisfying UX • One-click "All Done" button to mark everything complete at once • Uppercase any task individually, or transform all tasks globally • Each task is assigned a unique UUID, making state management clean and collision-free 📌 How it's built: • React (Vite) — fast builds, instant HMR during development • useState hooks power all the interactivity — no Redux, no overkill • Array methods (.map(), .filter()) handle all state mutations immutably • Fully controlled input component — value always driven by state • Modular CSS keeping styles scoped and clean 📌 Why it matters: Todo apps are a classic — but building one the right way means thinking about immutability, unique identifiers, controlled components, and clean re-renders. This project nails all of that. 🔗 Live demo: https://lnkd.in/gBvbsBQ5 Always building. Always shipping. 🔥 #React #JavaScript #Vite #FrontendDevelopment #WebDev #ReactJS #SoftwareDevelopment #Programming #TechProjects

Small changes, big impact. ✨ I just pushed version 1.0.5 of my Personal Dashboard Chrome Extension to the store! This update was all about giving users more control without sacrificing the minimalist aesthetic. What’s new: - Settings Menu: A brand new Glassmorphism-style panel. - Time Customization: Toggle between 12h and 24h formats (featuring a sleek technical "h" suffix). - Manual Location: Override GPS to see weather anywhere in the world. - Performance: Enhanced caching for instant load times. It’s amazing how a few lines of Vanilla JavaScript can completely change the daily workflow 😀 Check it out here ⬇️ : https://lnkd.in/eZztV2wJ You have the code in the first comment, feel free to give me some feedback 👏 #WebDevelopment #JavaScript #ChromeExtension #Coding #OpenSource #Frontend #UIUX

🚀 Stop Wasting Renders in React — Optimize Your App Like a Pro One of the most overlooked performance issues in React apps is wasted renders. A wasted render happens when a component re-renders without any actual change in the UI. Everything looks the same… but under the hood, React is doing unnecessary work. 💡 And in large applications? That cost adds up quickly. ⚠️ Why Should You Care? Slower UI interactions Increased CPU usage Poor user experience (especially on low-end devices) 🧠 Common Causes of Wasted Renders 👉 Parent components re-rendering unnecessarily 👉 Passing new object/function references every render 👉 Not memoizing expensive computations 👉 Over-reliance on global state updates 🛠️ How to Fix It ✅ Use React.memo Prevents re-render when props haven’t changed ✅ Use useCallback for functions Avoids recreating functions on every render ✅ Use useMemo for expensive calculations Caches results instead of recalculating ✅ Avoid inline objects & arrays They create new references every time ✅ Split components smartly Smaller components = more controlled re-renders 🔍 Real Insight Not every re-render is bad. 👉 React is designed to re-render efficiently 👉 Optimization is only needed when there’s a real performance issue The goal is simple: Render only when it actually matters. 🧩 Final Thought Performance optimization isn’t about writing more code — it’s about writing smarter code. If your app feels slow, don’t guess… Profile it, measure it, then optimize it. #React #Frontend #WebDevelopment #Performance #JavaScript #SoftwareEngineering #CleanCode

Day 16/21: Building Interactive Auth UIs in React! Authentication is the gateway to almost every modern web application. For Day 16 of my challenge, I moved beyond the product display and built a fully responsive Login & Signup UI from scratch. 🛠️ What I Implemented: State-Driven Navigation: Used React useState to toggle between Login and Signup modes seamlessly within a single component. Dynamic Form Rendering: Practiced conditional rendering to change headings, input fields, and buttons based on the user's intent. Consistent Branding: Leveraged Tailwind CSS to maintain a cohesive dark-themed aesthetic that matches my product catalog. UX Focus: Added intuitive "Sign up" and "Sign in" toggles at the bottom to ensure a frictionless user experience. 💡 The Engineering Challenge: As a Computer Science Engineer, I focused on keeping the component logic clean and reusable. Managing form states and ensuring the modal remains centered and responsive across all viewports was a great exercise in CSS Flexbox and React's lifecycle. Rebuilding my React skills through these daily sprints is proving to be incredibly effective. Seeing a static design come to life with logic is what I love most about development! 🔗 GitHub Repo: https://lnkd.in/g4gUwsjX Live URL : https://lnkd.in/gvkYUNAh #ReactJS #TailwindCSS #FrontendDevelopment #AuthUI #UserExperience #21DaysOfLinkedIn #MERNStack #CodingChallenge #CSByHeart

In one of my recent React projects, I struggled with something simple: The UI looked fine on my screen but completely broke on another device. At first, I tried adjusting margins, tweaking widths, adding random classes… Nothing worked consistently. Then I realized the actual issue: I wasn’t using a proper responsive structure. My components weren’t built with flexibility in mind. So I rebuilt the layout using: -Tailwind’s responsive classes -Consistent spacing -A clean container system -Reusable components And suddenly, the entire UI became stable — across screen sizes, browsers, and devices. The small win: fixing the layout. The big lesson: If the structure is wrong, no amount of “patching” will save the UI. Build clean → everything becomes easier. This one experience changed the way I approach every new project. #Frontend #ReactJS #CaseStudy #WebDevelopment #WomenInTech

Excited to unveil my latest project — SwiftDo! 📝✨ SwiftDo, a modern, high-performance Todo application designed for a seamless user experience. My primary goal was to combine minimalist aesthetics with robust functionality. Building this helped me go deep into React state management and advanced Tailwind CSS styling, ensuring that the app is not just functional, but also a joy to use. Key Features: ✅ Smart Category Filtering: Instantly toggle between 'All', 'Pending', and 'Completed' tasks. ✅ Persistent Data: Integrated LocalStorage to ensure your data stays intact even after a page refresh. ✅ Modern UI/UX: Crafted with a clean "Glassmorphism" inspired design and premium Gilroy typography. ✅ Fluid Interactions: Smooth transitions, intuitive task toggling, and a responsive layout for all devices. Tech Stack: ⚛️ React.js (Hooks, Functional Components) 🎨 Tailwind CSS (Utility-first styling & Custom Gradients) 💾 Browser LocalStorage API (Data Persistence) ⚡ Vite (Optimized Build Tool) 🔗 Project Links: 💻 GitHub Repository: https://lnkd.in/gHirFdCS 🚀 Live Deployment: https://lnkd.in/g5SRFZEV #ReactJS #WebDevelopment #TailwindCSS #FrontendEngineer #ProjectShowcase #ProductivityTools #Coding #JavaScript

The New Architecture (Fabric + TurboModules) is no longer optional — it’s becoming the standard. For years, React Native apps relied on the old bridge system. But now, things are changing FAST 👇 With Fabric + TurboModules, hooks-based APIs are increasing: Example from the latest libraries: useSecureStorage useSecret useSecureOperation 👉 New libraries are shifting to hook-first APIs for native features. ⚙️ What’s new? • Fabric → Faster UI rendering & smoother interactions • TurboModules → Efficient native module loading • Less bridge communication → Better performance ⚡ #ReactNative #MobileDevelopment #JavaScript #SoftwareEngineering #AppDevelopment #TechTrends #Developers

My client's app was bleeding users. 6.2-second load time. Brutal. The problem wasn't the design or the copy — it was a React SPA shipping a 2.4MB JavaScript bundle to every visitor before showing a single pixel. Here's what I did to fix it: → Migrated the 3 highest-traffic pages to Next.js with Server-Side Rendering (SSR) → Split the bundle using dynamic imports — lazy-loaded everything below the fold → Moved static content to Static Site Generation (SSG) with ISR for cache efficiency → Replaced heavy client-side data fetching with getServerSideProps Result after 2 weeks: — Load time: 6.2s → 2.4s (61% faster) — Largest Contentful Paint: 4.8s → 1.6s — Bounce rate dropped by 34% The client hadn't changed a single word of content. Just cleaner architecture. This is why I now audit the rendering strategy before touching the UI on every new project. What's the worst load time you've inherited on a project? Drop it below — curious how bad it gets out there. #nextjs #reactjs #webperformance #fullstackdeveloper #buildinpublic #llm #vibecoding #anthropic

One concept that really changed how I think about frontend performance is the Virtual DOM in React. At first, it sounds simple: “React updates the UI efficiently.” But when you understand what’s happening behind the scenes — creating a virtual representation, comparing changes (diffing), and applying only minimal updates — it becomes clear why React apps scale so well. The biggest takeaway for me: Good frontend performance is not just about writing UI components. It’s about minimizing unnecessary DOM operations. Understanding these internal concepts helps you write better React code and build more scalable applications. Great breakdown in this post. #ReactJS #FrontendDevelopment #WebPerformance #JavaScript #SoftwareEngineering

Rendering 10,000 items in the DOM is a mistake. Most apps don’t crash… They just become painfully slow. Scroll lag. Janky UI. High memory usage. All because we tried to render everything at once. Enter: List Virtualization Instead of rendering the full list: • You render only what’s visible on screen • As you scroll → old items unmount • New items mount dynamically 👉 The DOM stays small, fast, and predictable How it actually works • Track scroll position • Calculate visible window (start + end index) • Render only those items • Use spacer elements to preserve scroll height Libraries like react-window and react-virtualized handle this really well. Practical lesson I’ve seen apps go from unusable → smooth just by adding virtualization. But there’s a catch: • Dynamic heights are tricky • SEO can break (content not in DOM) • Accessibility needs extra care 💡 Takeaway Performance isn’t about doing less work. It’s about doing only the necessary work. Are you using virtualization in your apps, or still rendering everything and hoping React saves you? #Frontend #ReactJS #WebPerformance #JavaScript #SystemDesign