Nikolay T.’s Post

🚀 If your React Native app feels slow… It’s probably not React Native. Let’s get real 👇 ⚡ React Native is already fast 🐢 The real slowdown? How we build on top of it After shipping real production apps, one thing is clear: Performance isn’t a framework issue… It’s a decision issue. 🚫 “Everything re-renders all the time” ✅ Fix it with React.memo, useCallback, useMemo 🚫 “State is everywhere and nowhere” ✅ Bring order with Redux Toolkit or Zustand 🚫 “One screen does everything” ✅ Split it. Small components win every time 🚫 “FlatList is slow” ✅ It’s not—just unoptimized (keyExtractor, getItemLayout matter) 🚫 “Images are just assets” ✅ Nope—compress, optimize, lazy load 🚫 “JS thread will handle it” ✅ It won’t. Stop blocking it 🚫 “Let’s call the API again” ✅ Debounce it. Cache it. Respect it. 🚫 “Animations are optional polish” ✅ They define perceived performance (use Reanimated / native driver) 🔥 Real-world checklist that actually moves the needle: ⚙️ Turn on Hermes ⚡ Use MMKV instead of AsyncStorage 📊 FlashList for large data sets 📦 Keep bundle size lean 🧹 Kill unused dependencies 🔍 Profile with Flipper, don’t guess 🧪 Always test in production mode 💡 Here’s the uncomfortable truth: A “slow app” is usually just unclean thinking in code form. Because users don’t care about architecture diagrams or libraries… They care about this: 👉 “Does it feel instant?” 💬 Be honest — what’s the one performance mistake you’ve made that taught you the most? #ReactNative #MobileDevelopment #Performance #CleanCode #JavaScript #TypeScript #SoftwareEngineering #MobileApps #Redux #Zustand #DevTips

Reusing React.js code inside a React Native app using WebView 👇 It’s a common approach teams explore when trying to move faster. The idea sounds simple: “Why rebuild in React Native when we already have it in React (Web)?” So we embed the web app inside a WebView. And yes — it works. But the real story starts after that. What you gain: • Faster initial delivery   • Code reuse from web   • Reduced duplicate effort  What you quickly realize: • Performance depends on WebView rendering   • Native feel can be limited   • Communication between app ↔ web becomes complex   • Debugging spans two layers (native + web)   • Offline & device features need extra handling  In production, this becomes a trade-off: Speed vs Experience Senior lesson: WebView is not a shortcut. It’s an architectural decision. Use it when: → You need fast iteration   → Content is web-heavy   → Native interaction is minimal  Avoid it when: → You need high performance   → Deep native integrations   → Complex animations / gestures  React Native and React.js may look similar. But they solve different problems. Choosing how to combine them is where engineering judgment matters. Have you used WebView in production apps?   What challenges did you face? 👇 #ReactNative #ReactJS #MobileDevelopment  #SoftwareArchitecture #HybridApps #TechLeadership

If your React Native app feels slow, it’s probably not React Native. Let’s be honest. React Native is already capable of delivering solid performance. Most of the time, the real issue isn’t the framework — it’s how we build on top of it. After working on production apps, one thing becomes very clear: Performance problems are rarely technical limitations. They are usually the result of decisions. For example: When everything re-renders constantly, the problem is not React Native. It’s about missing optimizations like React. memo, useCallback, and useMemo. When state management feels chaotic, it’s often because there’s no clear structure. Tools like Redux Toolkit or Zustand can bring much-needed clarity. When a single screen tries to handle too much, performance suffers. Breaking it into smaller, focused components makes a huge difference. FlatList is often blamed for being slow, but in reality, it performs well when configured properly with keyExtractor and getItemLayout. Images are another overlooked area. Unoptimized images can quietly hurt performance. Compression, optimization, and lazy loading are essential. The JavaScript thread is not unlimited. Blocking it with heavy work leads to visible lag. Repeated API calls without control can slow things down. Debouncing and caching are simple fixes that go a long way. And animations are not just visual polish. They directly impact how fast your app feels. Using Reanimated or native drivers improves perceived performance significantly. Here are a few practices that consistently help in real-world apps: Turn on Hermes Use MMKV instead of AsyncStorage Use FlashList for large datasets Keep your bundle size small Remove unused dependencies Profile with Flipper instead of guessing Always test in production mode The uncomfortable truth is this: A slow app is often just the result of unclear thinking expressed in code. Users don’t care about your architecture or the libraries you chose. They care about one thing — does the app feel instant? What’s one performance mistake you made that taught you something valuable? #ReactNative #MobileAppDevelopment #AppPerformance #SoftwareDevelopment #ProgrammingTips #CleanCode #FrontendDevelopment #MobileDevelopment #TechLeadership #AppOptimization #JavaScript #DeveloperTips #CodingBestPractices #PerformanceMatters #BuildInPublic

Most React Native apps don't break. They slowly become harder to work with. I've seen this happen around the 4-6 month mark in a live product. At first, everything feels fast. Features ship quickly. The codebase is still clean. Then things change. 1. New features pile up 2. State logic grows 3. Quick fixes start stacking Suddenly: 1. One change affects multiple screens 2. Debugging takes longer than building 3. Developers hesitate before touching certain modules I used to think this was a React Native problem. It's not. It’s a growth problem. In one project, I dealt with this by refactoring while shipping: 1. Breaking tightly coupled modules step by step 2. Cleaning up Redux flows to reduce side effects 3. Standardizing patterns instead of adding new ones No rewrite. No big reset. Just consistent corrections. Over time, the codebase became usable again. Here’s the real lesson: Codebases don't become messy overnight. They decay quietly. And if you don't fix it early, you'll end up paying for it later. Have you experienced this in your projects? #softwareengineering #reactnative #refactoring

Day 40/100: React Native App Development Journey Today I implemented a fully functional Cart System with dynamic state management using Redux Toolkit. Here’s a breakdown of what I built and how it works 👇 State Management (Redux Toolkit) I structured my cart logic using a slice with clearly defined actions: addItemToCart removeItemFromCart (decrease quantity) removeProductFromCart (delete item completely) emptyCart The interesting part is how I handled existing vs new items: * If an item already exists → increment quantity and update sum * If not → push a new item with initial quantity: 1 This keeps the cart logic predictable and scalable. Dynamic Pricing Logic Each cart item maintains: price`(unit price) quantity sum(price × quantity) Then I compute: totalProductsPriceSum using reduce * Final OrderTotal = products total + shipping + taxes This ensures the UI always reflects real-time pricing updates. UI Behavior (CartScreen) I made the cart fully dynamic: * If `items.length > 0` → render cart list + totals + checkout button * Else → render `EmptyCart` component Also handled: * Incrementing item quantity * Decrementing item quantity * Removing items completely All wired through dispatched Redux actions. FlatList Optimization Using `FlatList` for rendering: * Efficient list updates * Clean separation via `CartItem` component * Actions passed as props → keeps components reusable HomeScreen Integration From the product list: * Each product dispatches `addItemToCart` * Seamless flow from browsing → cart What I focused on today * Clean separation of concerns * Predictable state updates * Real-time UI synchronization with global state * Handling edge cases (empty cart, removing last item, etc.) This is one of those features that looks simple on the surface but requires solid thinking underneath. I’d love to hear from other React Native devs 👇 How do you usually structure your cart logic? Do you compute totals in the store or in the UI layer? #ReactNative #ReduxToolkit #MobileDevelopment #100DaysOfCode #JavaScript #AppDevelopment #FrontendDevelopment #SoftwareEngineering

🚀 How React Native Works — And Why Optimization Matters Most developers use React Native… But very few truly understand how it works under the hood. At its core, React Native follows a simple flow: 👉 JavaScript Thread → Bridge → Native Components Sounds simple, right? But this is exactly where performance wins or breaks your app. 💡 Key Insight: Every interaction between JavaScript and Native goes through the Bridge — and it's asynchronous. That means: ⚠️ Too many calls = Performance bottlenecks ⚠️ Heavy logic in JS thread = UI lag ⚠️ Poor state management = Slow rendering --- 🔥 How to build optimized React Native apps: ✅ Minimize bridge communication ✅ Use FlatList instead of ScrollView for large data ✅ Avoid unnecessary re-renders (useMemo, useCallback) ✅ Optimize state management ✅ Move heavy work to native modules when needed --- 💭 Real learning: Building apps is easy. Building fast, scalable, optimized apps is what makes you a real developer. --- If you're preparing for real-world projects, 👉 Don’t just learn React Native… understand how it works internally. #ReactNative #MobileDevelopment #AppDevelopment #Performance #JavaScript #FullStack #SoftwareEngineering #Developers

Most developers miss how the bridge between native and JavaScript threads controls performance bottlenecks in React Native apps. Here’s the deal: React Native doesn’t run your JS logic directly on the native UI thread. Instead, it sends messages across a bridge, which means every interaction or data update involves this back-and-forth. I once debugged a sluggish feature where a button’s press handler kicked off heavy calculations entirely in JS, flooding the bridge with messages. Fix was simple: offload complex work to native modules and batch updates. The bridge architecture can become a choke point, especially with lots of rapid events or animations. Knowing this makes it easier to spot where your app might lag before even profiling. If you’re building cross-platform apps, consider what work needs to stay JS-side versus what should be native or even handled by native UI components. How have you tackled React Native performance issues related to the bridge? Any go-to patterns or tools to share? 🙌 #ReactNative #MobileDev #Performance #CrossPlatform #JavaScript #NativeModules #AppDevelopment #DevTips #Technology #SoftwareDevelopment #MobileDevelopment #ReactNative #CrossPlatformDevelopment #JavaScriptPerformance #ReactNativePerformance #Solopreneur #DigitalFirstFounders #AppDevelopers #Intuz

🚀 90% of React Native apps feel slow… And it's NOT React Native's fault. Let's be honest 👇 ⚡ React Native is fast 🐢 Poor implementation makes it slow After working on real-world apps, here's what actually matters: 🚫 Unnecessary re-renders ✅ Use React.memo, useCallback, useMemo 🚫 Poor state management ✅ Use Redux Toolkit / Zustand effectively 🚫 Heavy screens ✅ Break UI into small, reusable components 🚫 Unoptimized lists ✅ Optimize FlatList (keyExtractor, getItemLayout) 🚫 Large images ✅ Compress + lazy load images 🚫 Blocking JS thread ✅ Avoid heavy synchronous tasks 🚫 Too many API calls ✅ Debounce + cache responses 🚫 Bad animations ✅ Use Reanimated / native driver 🔥 Performance Checklist: ⚙️ Enable Hermes ⚡ Prefer MMKV over AsyncStorage 📊 Use FlashList for large datasets 📦 Keep bundle size small 🧹 Remove unused libraries 🔍 Profile with Flipper & DevTools 🧪 Always test in production mode 💡 Final Truth: Good code → ⚡ Smooth app Bad code → 🐢 Laggy app 👀 Users don't care how you built it… They only care how it feels. 💬 What's your go-to trick to improve React Native performance? #ReactNative #MobileDevelopment #AppPerformance #PerformanceOptimization #SuperAppArchitecture #JavaScript #TypeScript #SoftwareEngineering #CleanCode #Developers #Redux #Zustand #AndroidDevelopment #iOSDevelopment #CrossPlatform

🚀 90% of React Native apps feel slow… And it's NOT React Native's fault. Let's be honest 👇 ⚡ React Native is fast 🐢 Poor implementation makes it slow After working on real-world apps, here's what actually matters: 🚫 Unnecessary re-renders ✅ Use React.memo, useCallback, useMemo 🚫 Poor state management ✅ Use Redux Toolkit / Zustand effectively 🚫 Heavy screens ✅ Break UI into small, reusable components 🚫 Unoptimized lists ✅ Optimize FlatList (keyExtractor, getItemLayout) 🚫 Large images ✅ Compress + lazy load images 🚫 Blocking JS thread ✅ Avoid heavy synchronous tasks 🚫 Too many API calls ✅ Debounce + cache responses 🚫 Bad animations ✅ Use Reanimated / native driver 🔥 Performance Checklist: ⚙️ Enable Hermes ⚡ Prefer MMKV over AsyncStorage 📊 Use FlashList for large datasets 📦 Keep bundle size small 🧹 Remove unused libraries 🔍 Profile with Flipper & DevTools 🧪 Always test in production mode 💡 Final Truth: Good code → ⚡ Smooth app Bad code → 🐢 Laggy app 👀 Users don't care how you built it… They only care how it feels. 💬 What's your go-to trick to improve React Native performance? #ReactNative #MobileDevelopment #AppPerformance #PerformanceOptimization #JavaScript #TypeScript #SoftwareEngineering #CleanCode #Developers #Redux #Zustand #AndroidDevelopment #iOSDevelopment #CrossPlatform

React Native’s New Architecture is finally delivering the kind of performance gains teams have been waiting for. Fabric + TurboModules aren’t just internal rewrites — they meaningfully improve how React Native apps render and communicate between JavaScript and native code. What’s changing: • Fabric introduces a modern rendering system • TurboModules make native module loading faster and more efficient • The new architecture reduces bridge overhead with a more direct communication model • Better startup time, smoother UI, and improved responsiveness Why it matters: For developers: - Less bottleneck between JS and native - More predictable rendering behavior - Better support for concurrent features For product teams: - Faster app interactions - Improved scroll/render performance - Better user experience on lower-end devices The biggest win is that React Native is no longer just “good enough” for cross-platform — it’s becoming a serious choice for high-performance mobile apps. If you’re building in React Native, this is the moment to start testing and adopting the new architecture. Have you enabled Fabric or TurboModules in production yet? Curious to hear what performance gains you’ve seen. #ReactNative #MobileDevelopment #JavaScript #iOS #Android #SoftwareEngineering #AppDevelopment Summary: Wrote a concise LinkedIn post highlighting React Native’s new architecture, key benefits, and performance impact. #CrossPlatform #MobileDev #Flutter #ReactNative