React Native App Slow: 7 Key Issues to Check First

Your React app isn’t slow. Your architecture is. Most performance issues don’t come from React itself. They come from: • unnecessary re-renders • oversized bundles • uncontrolled API calls • unmeasured performance Here are 5 optimization techniques developers often ignore, but shouldn’t. Because performance isn’t something you “add later.” It’s something you design for. What’s the most frustrating performance issue you’ve debugged? SRK signing off! 💛 #ReactJS #FrontendDevelopment #WebPerformance #JavaScript #SoftwareEngineering

Most React devs bring their SPA habits into Next.js — and their users pay the price. 👇 You've written it a hundred times: useState for data, useEffect to fetch it, a spinner while they wait. It works in React. In Next.js App Router, it's the wrong pattern entirely. Server Components let you fetch data inside the component — on the server, before the page hits the browser. No loading state. No extra JS bundle. No hydration issues. HTML that arrives ready. I've swapped dozens of useEffect fetch patterns for async Server Components and the Lighthouse scores jump immediately. Use the server for reads. Use useEffect for things only the browser can do. #NextJS #ReactJS #WebDevelopment #JavaScript #TypeScript #AppRouter #ServerComponents #ReactHooks #FrontendDeveloper #SoftwareEngineer #CleanCode #100DaysOfCode #WebPerformance #Programming #WebDev #NextJS14 #FullStackDeveloper #CodeQuality

Every time I start a new React project, I copy the same 5 hooks. Not from a library. From my own collection, battle-tested across 15+ production apps. These aren't clever abstractions. They're boring, reliable utilities that eliminate the same bugs I've fixed dozens of times: 1. useDebounce — stop hammering your API on every keystroke 2. usePrevious — track previous values without infinite re-render loops 3. useLocalStorage — state that survives refresh (SSR-safe, GDPR-aware) 4. useMediaQuery — responsive logic, not just responsive styles 5. useAbortController — cancel requests on unmount, prevent race conditions 5 files. ~150 lines total. Zero dependencies. Senior engineers don't write more code. They carry better defaults. Full TypeScript implementations you can copy today: https://lnkd.in/dguYtize What's the one custom hook you can't live without? #React #TypeScript #CustomHooks #WebDevelopment #JavaScript #DeveloperProductivity #CleanArchitecture #NodeJS

Good list - this is basically the 'React starter pack' ))) I’d add one more that saved me a lot of headaches - useAsync (or useRequest) - wraps loading/error/data + cancellation in one place. Especially useful when combined with AbortController to avoid race conditions and stale state updates.

Hot take: most React apps are over-engineered. After 7 years and hundreds of codebases, here's what I see teams reach for vs what they actually needed: ❌ Redux → ✅ Zustand ❌ Custom fetch everywhere → ✅ React Query ❌ Design system from scratch → ✅ Shadcn + Tailwind ❌ pages/components/hooks/utils folders → ✅ Feature-based folders Simple is not lazy. Simple is a decision. Match your tool to your problem — not to what the last senior dev you admired was using. Which one do you still see in production in 2026? 👇 #ReactJS #Frontend #JavaScript #FrontendEngineering #TypeScript #WebDevelopment #SoftwareEngineering

Javascript concept: Callbacks Callbacks are simple at first: function greet(fn) { fn(); } But in real-world apps: doA(() => { doB(() => { doC(() => {}); }); }); 😵 This becomes hard to read and maintain. 💡 This problem is called callback hell 🚀 Solution: → Promises → Async/Await #JavaScript #WebDevelopment #Frontend #Coding #LearnToCode

Your React app is slow. Here's why. 🐢 Most devs jump straight to optimization tools. But 90% of the time, the fix is simpler: 🔴 Fetching data in every component independently → Lift it up or use a global state solution 🔴 Importing entire libraries for one function → `import _ from 'lodash'` hurts. Use named imports. 🔴 No lazy loading on heavy routes → React.lazy() exists. Use it. 🔴 Images with no defined size → Layout shifts kill perceived performance 🔴 Everything in one giant component → Split it. React re-renders what changed, not what didn't. Performance isn't magic. It's just not making avoidable mistakes. Save this for your next code review. 🔖 #ReactJS #Frontend #WebPerformance #JavaScript #WebDev

#React Compiler is changing how we optimize React apps. For years, we relied on useMemo, useCallback, and React.memo to prevent unnecessary re-renders. Now the React Compiler can automatically memoize many cases at build time. But that doesn’t mean these hooks are dead. You still need them when: • working with useEffect dependencies • integrating with third-party libraries • optimizing expensive computations The new rule in 2026 React development: 1. Write pure components 2. Trust the compiler 3. Optimize only when profiling proves it Slides explaining this 👇 #React #ReactJS #Frontend #WebDevelopment #JavaScript #SoftwareEngineering

🧵 Day 6 of 40 — React System Design Series Context API is one of the most misused tools in React. I've seen it used as a global Redux replacement. I've seen it tank app performance silently. I've seen devs abandon it entirely — for the wrong reasons. The truth: Context is brilliant for one specific thing. And a quiet disaster for another. Today I broke down: → What Context actually solves (and it's not what most tutorials say) → The re-render trap that kills performance (and how to avoid it) → A production-quality Auth Context implementation → Context vs Zustand vs Redux — the honest comparison Full breakdown with real TypeScript code 👇 https://lnkd.in/d3dty56W #ReactJS #SystemDesign #Frontend #LearningInPublic #WebDevelopment

Ever wondered what actually happens inside React when your app updates? React does not directly change the browser UI every time something updates. Instead, it creates a Virtual DOM, which is a lightweight copy of the real DOM. When data changes, React builds a new Virtual DOM and compares it with the previous version. This process is known as reconciliation. • React checks what has changed between two versions • It updates only those specific parts in the real DOM • This makes updates faster and avoids unnecessary reloading React also follows a component-based structure. Each component manages its own state and logic, making the code easier to understand, reuse, and maintain. When state or props change, React decides when and how to re-render efficiently. This is why React applications stay fast even when they become large and complex. For more details, go to the link and see the full post: https://lnkd.in/eU-YtJw7 #React #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #Programming #SoftwareEngineering #MERNStack