React Performance Optimization Tips for Large Datasets

𝗗𝗼 𝗥𝗲𝗮𝗰𝘁 𝗛𝗼𝗼𝗸𝘀 𝗠𝗮𝗸𝗲 𝗥𝗲𝗱𝘂𝘅 𝗢𝗯𝘀𝗼𝗹𝗲𝘁𝗲? 🤔 This is something I’ve been thinking about while working on different projects recently. My honest take: Hooks can replace Redux in some cases - but not everywhere. It really comes down to how complex your application is. 🟢 𝗪𝗵𝗲𝗿𝗲 𝗛𝗼𝗼𝗸𝘀 𝗪𝗼𝗿𝗸 𝗪𝗲𝗹𝗹 For most small to mid-sized apps, hooks are more than enough. I usually rely on: • useState for local state • useReducer for structured updates • useContext for sharing state This setup works great when: ✔ state is not too deeply shared ✔ logic stays close to components ✔ UI-driven interactions dominate It keeps things simple and avoids unnecessary complexity. 🟡 𝗪𝗵𝗲𝗿𝗲 𝗥𝗲𝗱𝘂𝘅 𝗦𝘁𝗶𝗹𝗹 𝗔𝗱𝗱𝘀 𝗩𝗮𝗹𝘂𝗲 Once the application starts growing, things change. You begin to need: ✔ a single source of truth ✔ predictable state transitions ✔ better debugging and traceability ✔ structured handling of async flows That’s where Redux (especially with Redux Toolkit) still makes a lot of sense. ⚖️ 𝗛𝗼𝘄 𝗜 𝗧𝗵𝗶𝗻𝗸 𝗔𝗯𝗼𝘂𝘁 𝗜𝘁 Hooks → Great for keeping things lightweight and component-focused Redux → Better for managing large-scale application state Or simply: Small project → Hooks Complex product → Redux 💡 𝗞𝗲𝘆 𝗧𝗮𝗸𝗲𝗮𝘄𝗮𝘆 Hooks didn’t replace Redux - they just gave us a better option for simpler use cases. In real-world engineering, it’s rarely about picking one “best” tool. It’s about making the right trade-off based on the problem you’re solving. Curious to hear your approach - Do you stick with hooks, or still prefer Redux for larger apps? 👇 #ReactJS #Frontend #FullStack #WebDevelopment #SoftwareEngineering #JavaScript #nextjs

🚀 𝗙𝗶𝘅𝗶𝗻𝗴 𝗥𝗲𝗮𝗰𝘁 𝗧𝗮𝗯𝗹𝗲 𝗟𝗮𝗴 𝗪𝗵𝗲𝗻 𝗨𝘀𝗲𝗿𝘀 𝗦𝗲𝗹𝗲𝗰𝘁 𝗠𝘂𝗹𝘁𝗶𝗽𝗹𝗲 𝗥𝗼𝘄𝘀 Recently worked on a performance issue where the React Table UI started lagging whenever users selected multiple rows. As the number of selected rows increased, the table became slow and less responsive. 🔍 𝗥𝗼𝗼𝘁 𝗖𝗮𝘂𝘀𝗲: Unnecessary re-renders of rows and table components Expensive state updates on every selection change Repeated calculations during row selection 💡 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻 𝗜𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗲𝗱: Optimized state management for row selection Used useMemo and useCallback to prevent redundant renders Applied component memoization for better rendering control Ensured only affected rows updated instead of the full table refresh ✅ 𝗥𝗲𝘀𝘂𝗹𝘁: Smooth multi-row selection Faster UI response time Better scalability for large datasets Improved overall user experience 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝗶𝘀 𝗻𝗼𝘁 𝗷𝘂𝘀𝘁 𝗮𝗯𝗼𝘂𝘁 𝘀𝗽𝗲𝗲𝗱 — 𝗶𝘁’𝘀 𝗮𝗯𝗼𝘂𝘁 𝗰𝗿𝗲𝗮𝘁𝗶𝗻𝗴 𝗮 𝘀𝗲𝗮𝗺𝗹𝗲𝘀𝘀 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗳𝗼𝗿 𝘂𝘀𝗲𝗿𝘀. ⚡ #ReactJS #FrontendDevelopment #PerformanceOptimization #JavaScript #WebDevelopment #ReactTable #UIUX #CodingJourney

Shipped a few performance improvements this week. Started from one important part: the critical rendering path. I thought: if I don’t know what blocks first paint, I'm optimizing blindly. ✅ Code splitting - Removed non-critical UI (dialogs, popovers, interaction-only components) from the initial bundle and lazy loaded them. ✅ Network requests Audited every fetch with two questions: → Does this need to happen now? → Does it need to happen this often? - Found a Stripe call firing on every popover open. The response is stable within a session → now fetched once and reused. - Replaced fixed polling with exponential backoff for async processes. Same outcome, fewer requests. ✅ Skeleton screens: They don’t make data faster, but they improve perceived performance and reduce drop-off. #webperformance #frontend #reactjs #nextjs #performance #ux #developers #softwareengineering #buildinpublic #webengineering #webdevelopment #javascript #webdev --- I post about web engineering, front-end and soft skills in development. Follow me here: Irene Tomaini

What is useOptimistic? useOptimistic is a React Hook for optimistic UI updates — where you assume an action will succeed and reflect it immediately in the interface. Instead of waiting for an API response: - user clicks → UI updates instantly - request runs in the background - final state syncs when response arrives const [optimisticState, setOptimisticState] = useOptimistic(initialState); Under the hood, React temporarily renders this “optimistic” state while the async action is in progress, then replaces it with the real data once it’s ready. There is the example on the screenshot and there: - click -> count increases immediatly - request runs in background - final state replaces optimistic one It’s a small API, but a big UX upgrade. #react #frontend #webdev #javascript #reactjs #performance

🚀 Why useOptimistic Must Run Inside a Transition (React Deep Dive) One subtle but powerful concept in React’s concurrent world 👇 👉 useOptimistic must run inside a transition because optimistic updates are intentionally low-priority, interruptible, and reversible — exactly what transitions are designed for. Let’s unpack that. When you use useOptimistic, you're telling React: “Show this UI as if the action succeeded… even before it actually does.” This means: The update is temporary It might need a rollback It should not block user interactions Now, if this runs like a normal state update: ❌ It becomes high-priority ❌ It blocks rendering ❌ It behaves like final truth That’s dangerous. Instead, wrapping it in startTransition tells React: ✅ This is non-urgent ✅ This can be interrupted ✅ This may be discarded or replaced And that’s exactly what optimistic UI needs. 💡 Think of it like this: Typing → urgent Navigation → transition Optimistic UI → speculative transition 🔥 Real insight: React isn’t just giving you a hook — it’s giving you a contract: “If you're doing speculative UI, you must let me schedule it properly.” 🧠 Takeaway Optimistic updates are not just faster UI — they’re carefully scheduled illusions. And transitions are what make those illusions safe. #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #ReactHooks #ConcurrentReact #Performance #SoftwareEngineering #UIUX #TechInsights

✨ 𝐆𝐨𝐨𝐝 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐯𝐬. 𝐆𝐫𝐞𝐚𝐭 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: 𝐓𝐡𝐞 𝐏𝐨𝐰𝐞𝐫 𝐨𝐟 𝐌𝐢𝐜𝐫𝐨-𝐃𝐞𝐭𝐚𝐢𝐥𝐬 We spend a lot of time debating frameworks—Next.js vs. React, Tailwind vs. CSS Modules. But at the end of the day, users don't care about our stack. They care about how the application feels. I’ve found that taking a UI from "good" to "great" usually comes down to a few small, deliberate details: 🔹 𝐒𝐤𝐞𝐥𝐞𝐭𝐨𝐧𝐬 𝐨𝐯𝐞𝐫 𝐒𝐩𝐢𝐧𝐧𝐞𝐫𝐬: Replacing a generic loading circle with a skeleton UI reduces perceived waiting time and keeps the user grounded. 🔹 𝐏𝐫𝐞𝐝𝐢𝐜𝐭𝐚𝐛𝐥𝐞 𝐇𝐨𝐯𝐞𝐫 𝐒𝐭𝐚𝐭𝐞𝐬: Buttons should feel interactive before they are even clicked. A subtle transition on hover or focus adds immediate polish. 🔹 𝐆𝐫𝐚𝐜𝐞𝐟𝐮𝐥 𝐄𝐫𝐫𝐨𝐫 𝐇𝐚𝐧𝐝𝐥𝐢𝐧𝐠: "An error occurred" helps no one. Guiding the user back to safety with clear, actionable UI states builds trust. Great frontend development is about empathy for the end-user. 👇 𝐋𝐞𝐭’𝐬 𝐝𝐢𝐬𝐜𝐮𝐬𝐬: What is one small UI detail that instantly makes a website feel more premium to you? #FrontendDevelopment #UIUX #WebDesign #ReactJS #TailwindCSS #UserExperience #SoftwareDeveloper #SoftwareEngineering

🔥 Problem / Situation I built a website that looked perfect… But users were leaving within seconds. 💡 Simple Explanation The issue wasn’t code — It was user flow. Users didn’t know: 👉 Where to click 👉 What to do next 🚀 Insight / Learning So I made 3 simple changes: Added clear CTA buttons Reduced unnecessary sections Improved loading speed Result? Better engagement + longer session time. 🤝 CTA Still learning & building better systems every day. If you need a developer who focuses on real user experience, let’s connect. #FullStackDeveloper #MERN #WebDevelopment #Frontend #LearningInPublic #Developers #UIUX #CodingJourney #TechCareers #JavaScript #Portfolio

𝘂𝘀𝗲𝗘𝗳𝗳𝗲𝗰𝘁 𝘃𝘀 𝘂𝘀𝗲𝗟𝗮𝘆𝗼𝘂𝘁𝗘𝗳𝗳𝗲𝗰𝘁 𝗶𝗻 𝗥𝗲𝗮𝗰𝘁 — 𝗖𝗵𝗼𝗼𝘀𝗶𝗻𝗴 𝘁𝗵𝗲 𝗥𝗶𝗴𝗵𝘁 𝗛𝗼𝗼𝗸 𝗮𝘁 𝘁𝗵𝗲 𝗥𝗶𝗴𝗵𝘁 𝗧𝗶𝗺𝗲 React gives developers powerful hooks to manage side effects, but understanding when each hook runs can make a significant difference in UI performance and user experience. Two commonly misunderstood hooks are: 🔹 𝘂𝘀𝗲𝗘𝗳𝗳𝗲𝗰𝘁() useEffect runs after the browser has painted the UI. This makes it the right choice for:  • API requests  • Event listeners  • Subscriptions  • Logging  • Updating external systems Because it runs after paint, it does not block rendering, helping keep your application fast and responsive. 🔹 𝘂𝘀𝗲𝗟𝗮𝘆𝗼𝘂𝘁𝗘𝗳𝗳𝗲𝗰𝘁() useLayoutEffect runs immediately after the DOM updates but before the browser paints the screen. This makes it useful for:  • Reading element dimensions  • Measuring layout  • Scroll position adjustments  • Preventing visual flicker  • Synchronizing DOM changes before display Since it runs before paint, users never see intermediate layout changes. 𝗪𝗵𝘆 𝗶𝘁 𝗺𝗮𝘁𝘁𝗲𝗿𝘀 Using the wrong hook can lead to: ❌ Layout shifts ❌ Flickering UI ❌ Incorrect measurements ❌ Less predictable rendering behavior Choosing the correct hook leads to: ✅ Smoother interfaces ✅ Better visual stability ✅ More predictable components 𝗦𝗶𝗺𝗽𝗹𝗲 𝗿𝘂𝗹𝗲 𝗼𝗳 𝘁𝗵𝘂𝗺𝗯 Use useEffect → for most side effects Use useLayoutEffect → when layout or visual updates must happen before paint Small React details like this often separate working code from polished frontend engineering. #React #JavaScript #FrontendDevelopment #WebDevelopment #SoftwareEngineering

The world of UI development just got a major performance boost. Cheng Lou (former React core team member and Midjourney engineer) has released Pretext a fast, secure, and accurate text measurement library written in pure TypeScript. Unless you have an intense, borderline obsessive interest in the engineering of train schedules, text measurement might sound dry. But for developers building complex UIs, this is a massive game-changer. The Problem: The Layout Reflow Since the dawn of the internet, rendering dynamic text has come with a heavy performance cost. Whenever a browser needs to determine the height of a paragraph or where a line breaks, it triggers a layout reflow. This calculates the geometry of almost everything on the page, making it one of the most expensive operations a browser can perform. This makes building text heavy UIs like virtualized lists or masonry layouts incredibly difficult to optimize. The Solution: Bypassing the DOM Pretext changes the game by completely bypassing the traditional browser text rendering pipeline that has been the standard for decades. Canvas API Power: It uses the Canvas API, which lives outside the DOM, to get the pixel width for any string in any font without triggering a single reflow. Custom Line Break Algorithm: To handle the "crawling through hell" part of the engineering, Cheng Lou developed a custom algorithm that replicates how browsers across every language handle line breaks. Efficient API: The process is simple: you first prepare your text to segment and cache widths, then call layout to get the total height and line count all without ever touching the DOM. Whether you're building a high speed chat app or complex data visualizations, Pretext proves that the browser doesn't have to own text measurement anymore. Stop letting layout reflows slow down your applications. I’ve also included an infographic that visually explains how Pretext works and its performance benefits. Take a look! #WebDev #TypeScript #SoftwareEngineering #Frontend #Pretext #TechNews

Most people think UI development is slow, messy, and full of compromises It doesn’t have to be Here’s a combo that completely changed how I build interfaces: ⚛️ React 🎨 Tailwind CSS 🧩 shadcn/ui This stack is not just about building fast—it's about building clean, scalable, and beautiful UIs without fighting your code Why it works so well: Tailwind CSS → utility-first, no more context switching between files shadcn/ui → real components you own (not a black box library) React → flexible architecture to scale anything 👉 The real power? You’re not installing a heavy UI framework You’re composing your own design system No more: ❌ overriding endless CSS ❌ fighting component libraries ❌ inconsistent design Instead: ✅ full control over UI ✅ consistent, reusable components ✅ modern, clean design out of the box This is how a modern frontend should feel: fast, flexible, and actually enjoyable If you’re still stuck with bloated UI libraries… it might be time to switch What’s your go-to UI stack right now? #ReactJS #TailwindCSS #shadcn #FrontendDevelopment #UIUX #WebDevelopment #JavaScript #DesignSystems #CleanCode #DeveloperExperience #Programming #DevCommunity