Ahmad Faisal Alhendi’s Post

⚡ Optimizing Angular Performance: Small Changes, Big Impact If you’ve worked on large-scale Angular apps, you know how quickly performance can become a bottleneck. The good news? A few focused optimizations can deliver noticeable improvements. One of the most effective techniques I’ve used is switching to the OnPush change detection strategy. By limiting when Angular checks for updates, we reduced unnecessary re-renders and saw up to a 30% improvement in UI responsiveness. Another game-changer is lazy loading modules. Instead of loading the entire app upfront, breaking features into smaller chunks helps reduce the initial bundle size and significantly improves load time—especially for enterprise-scale applications. A couple of practical takeaways: Use Angular CLI to analyze bundle sizes and catch performance issues early. Keep your architecture clean with modular, reusable components—it makes scaling and optimizing much easier down the line. Performance optimization isn’t about one big fix—it’s about consistently making smarter choices across the codebase. What’s one optimization that made a noticeable difference in your Angular projects? #Angular #WebDevelopment #Frontend #Performance #JavaScript

Angular app was fast… until it wasn’t. Everything looked fine in development. Clean UI, smooth navigation, no visible issues. But in production? Users started complaining: → Slow page loads → UI freezing during interactions → Inconsistent data rendering At first, nothing obvious stood out. No major errors. No crashes. So I dug deeper. What I found: The issue wasn’t one big bug it was a combination of small mistakes:  • Multiple unnecessary API calls triggered on component reloads  • Heavy components re-rendering more often than needed  • Poor state handling causing redundant updates  • No proper change detection strategy Individually, these didn’t seem critical. Together, they were killing performance. What I changed:  • Switched to OnPush change detection to control unnecessary re-renders  • Optimized API calls using RxJS (switchMap, debounceTime)  • Introduced better state handling to avoid duplicate requests  • Broke down heavy components into smaller, reusable ones  • Added lazy loading for modules to reduce initial load time The result:  • 40% faster page load time  • UI responsiveness improved significantly  • Reduced redundant API calls by 50%  • Drop in user-reported performance issues If you’re working with Angular and facing random performance issues, check your change detection and API patterns first it might save you hours. #Angular #WebDevelopment #Frontend #Performance #JavaScript #SoftwareEngineering #FullStack

🚀Angular Project Structure — Simplified & Practical 🚀Ever opened an Angular project & wondered where everything goes? 🤯 🚀Getting the structure right is key to building scalable apps. 📁 Key Folders • src/app → Core logic (components, services, modules) • assets → Images & static files • environments → Dev vs Prod configs 📄 Important Files • main.ts → App entry point • angular.json → Build configuration • package.json → Dependencies & scripts 💡 Quick Tip: Don’t dump everything in one place — go for a feature-based structure like user/, dashboard/, auth/ for better scalability. 👉 How do you structure your Angular projects? Feature-based or type-based? #Angular #Frontend #WebDevelopment #CleanCode #SoftwareEngineering

One of the changes I genuinely like in modern Angular is Standalone Components. For a long time, almost everything in Angular had to go through NgModules. 
They did the job, but they also meant more files, more setup, and more time explaining things — especially to new team members. Standalone Components make things feel much more straightforward. NgModules haven’t disappeared — but it’s nice that Angular no longer forces us to use them everywhere. If you were starting a new Angular app today — would you still use NgModules, or go fully standalone? #Angular #WebDevelopment #Frontend #TypeScript #SoftwareEngineering #AngularTips

Your Angular app isn’t slow it’s leaking memory. And you’re probably the reason. Yeah not the backend not the API. Your RxJS usage. I keep seeing this everywhere: this.http.get(...).pipe(takeUntil(this.destroy$)).subscribe() Feels “clean”. Feels “safe”. But here’s the uncomfortable truth You’re fixing the wrong problem. For HttpClient: emits once auto completes no memory leak So why are you adding takeUntil here? Habit. Not understanding. Meanwhile the real leaks are here: valueChanges interval switchMap chains Streams that never complete And this is where your app starts breaking silently: duplicate API calls ghost subscriptions UI updating after navigation No errors. Just bad engineering. The Truth is Most developers don’t have memory leak issues because Angular is hard. They have it because: they don’t understand observable lifecycles. Stop asking: Should I use takeUntil everywhere? Start asking: Will this stream outlive my component? Hard take: Using patterns blindly doesn’t make you a better developer It just hides the fact that you don’t understand them. Be honest: Where have you actually faced issues? A) HTTP calls B) Long-lived streams (valueChanges, RxJS chains) #Angular #RxJS #MemoryLeaks #Frontend #SoftwareEngineering #CleanCode #JavaScript #Typescript #WebDevelopment #TechTruths

𝗧𝗶𝘁𝗹𝗲: Why Your Angular App Feels Slow – Common Mistakes & Fixes 𝗜𝗻 𝗼𝘂𝗿 𝗹𝗮𝘁𝗲𝘀𝘁 𝗯𝗹𝗼𝗴, 𝘄𝗲 𝗰𝗼𝘃𝗲𝗿: ✅ Why Angular apps feel slow even when everything works ✅ Common performance mistakes developers make ✅ Change detection issues & how OnPush improves speed ✅ Avoiding heavy logic inside templates ✅ Optimizing large lists with trackBy ✅ Reducing unnecessary API calls using RxJS ✅ Lazy loading for faster initial load time ✅ Critical CSS, caching & compression techniques ✅ Bundle size optimization & image performance tips ✅ Advanced practices like SSR, PWA & state management ✅ Tools to monitor and debug Angular performance ✅ Real-world case study to improve app speed by 40% Discover how small Angular optimizations can significantly improve speed, responsiveness, and user experience. 👉 Read the full guide here: https://lnkd.in/gTzjDV-A #Angular #WebDevelopment #FrontendDevelopment #AngularPerformance #JavaScript #TypeScript #WebPerformance #Coding #SoftwareDevelopment #CodemechSolutions #UIUX #DeveloperTips

Angular Signals vs RxJS — when should you use what? After working with Angular 17/18, here’s my practical take: ✔ Use Signals for: Local state UI-driven updates Simpler reactivity ✔ Use RxJS for: API calls Streams (websocket, events) Complex async flows 👉 Signals reduce boilerplate 👉 RxJS still wins for async complexity The best Angular apps use BOTH — not one over the other. What’s your experience so far? #Angular #Frontend #WebDevelopment

“Just add a setTimeout” — the most dangerous quick fix in Angular ⚠️ Every frontend dev has done this 😅 ViewChild not getting value in ngOnInit? 👉 Add setTimeout API response coming late? 👉 Add setTimeout UI not updating? 👉 Add another setTimeout It works… for now ✅ But slowly your app starts showing 👇 ❌ Laggy screens ❌ Delayed clicks ❌ Random UI glitches ❌ Hard-to-debug issues The real problem isn’t timing. 👉 It’s lifecycle understanding. Usually the fix is: ✔️ Use ngAfterViewInit for ViewChild ✔️ Wait for actual API response / observable ✔️ Avoid artificial delays Quick fixes save minutes today… but cost hours later 👀 Have you ever fixed a bug with setTimeout first? 😄 #Angular #Frontend #WebDevelopment #Debugging #CleanCode #dom

Angular app felt lightning fast… until real users started using it. Everything worked perfectly in development. Smooth UI, quick navigation, no warnings. But production told a different story: • Pages taking longer to load • UI lag during user actions • Data flickering or updating unpredictably No crashes. No obvious errors. Just a poor user experience. So I started digging. The problem? Not one big issue — but multiple small inefficiencies adding up: • Repeated API calls triggered unintentionally • Components re-rendering more than required • Inefficient state flow causing duplicate updates • Default change detection doing more work than needed Individually manageable. Together? A performance bottleneck. Here’s what I did: • Adopted OnPush change detection to reduce unnecessary DOM updates • Optimized API handling using RxJS (switchMap, debounceTime) • Cleaned up state flow to eliminate redundant requests • Split large components into smaller, focused ones • Implemented lazy loading to improve initial load performance The outcome: • Noticeably faster load times • Smoother UI interactions • Significant reduction in redundant API calls • Better overall user experience Lesson learned: Performance issues in Angular are often silent. If your app “feels slow” but looks fine — check change detection and data flow first. #Angular #Frontend #WebPerformance #RxJS #JavaScript #SoftwareEngineering

Most Angular apps don’t start slow… They become slow over time. I’ve seen this happen multiple times. At the beginning: Everything feels fast. Clean architecture. Smooth UI. 6–12 months later: Slower builds Laggy UI Hard-to-track performance issues So what actually goes wrong? 1. Too many unnecessary change detections Default strategy everywhere = performance hit. Solution: Use OnPush where possible. 2. Unoptimized RxJS usage Nested subscriptions Unmanaged streams Result: Memory leaks + unnecessary re-renders. 3. Heavy components doing too much work Business logic + UI + API calls in one place. Hard to scale. 4. No lazy loading strategy Everything bundled together. Initial load becomes heavy. 5. Ignoring bundle size growth Every feature adds more code. No one tracks the impact. But here’s the truth: Performance issues don’t come from Angular. They come from how we use it. What actually helped me: – Moving to OnPush + smarter state flow – Using async pipe instead of manual subscriptions – Breaking components into smaller units – Monitoring bundle size regularly The biggest shift: Performance is not a one-time optimization. It’s a continuous discipline. Curious: What was the biggest performance issue you faced in Angular? #Angular #WebPerformance #FrontendDevelopment #JavaScript #SoftwareEngineering #CleanCode