Frontend Performance Analysis with Lighthouse

We often hear that JavaScript is single threaded. But at the same time, it handles API calls, timers, and UI updates smoothly. The reason is the Event Loop. Here is a simple way to understand it. Think in terms of 5 parts: 1. Call Stack This is where code runs right now. If something blocks here (like an infinite loop), everything else stops. 2. Web APIs The browser handles things like fetch, setTimeout, and events outside the main thread. When they are done, they send callbacks to queues. 3. Microtask Queue (high priority) This includes Promise callbacks and async/await. All microtasks run completely before anything else happens. -> If you keep adding microtasks (like recursive Promise.then), you can actually block rendering completely. 4. Macrotask Queue (low priority) This includes setTimeout, setInterval, and other tasks. Only one macrotask runs at a time. 5. Render After microtasks are done, the browser updates the UI (layout and paint). -> The browser decides when to paint — not strictly after every loop. Simple cycle: Run one macrotask → run all microtasks → update UI → repeat JavaScript isn’t non-blocking — the event loop just makes it feel that way. #javascript #frontend #reactjs #webdevelopment #softwareengineering #webperformance #systemdesign #Coding

I built a Pomodoro timer into ACE and honestly it's been one of those features I didn't know I needed until I had it. The idea was simple. I was using ACE to study and kept switching tabs to find a timer. So I just built one in. 25 minutes. Focus. Break. Repeat. If you're building something, don't sleep on the small features. Sometimes the thing that makes your product actually usable isn't the AI or the fancy architecture. It's the 25 minute timer sitting quietly in the corner. #buildinpublic #nextjs #webdevelopment #javascript #frontenddevelopment

Just built a dynamic product card using JavaScript DOM manipulation What I love about this project is how flexible it is — I can generate as many cards as I want dynamically, making it super useful for real-world applications like e-commerce or dashboards. Features: Fully dynamic card creation using DOM Clean and modern UI design Reusable component structure Easy to scale for multiple products This project helped me strengthen my understanding of how the DOM really works behind the scenes — not just static HTML, but building everything programmatically. 📂 GitHub Repository: https://lnkd.in/gwcZG2pf Would love to hear your thoughts or suggestions for improvement! #JavaScript #WebDevelopment #Frontend #DOM #Coding #Projects #Learning #100DaysOfCode

🚀 Improving Frontend Performance with Throttling & Debouncing One key realization while optimizing UI performance 👇 👉 Not all issues are about page load 👉 Many come from how frequently our code runs 🧠 The Problem Events like scroll 📜, resize 📏, and typing ⌨️ can fire hundreds of times per second This leads to: ❌ unnecessary work ❌ busy main thread ❌ poor responsiveness ⚙️ The Solution 🔹 Throttling 👉 Limit execution frequency 👉 e.g., run once every second 🔹 Debouncing 👉 Execute only after user stops 👉 e.g., search after typing stops 🎯 Key Difference 👉 Throttle = steady control 👉 Debounce = wait then act 📊 Why it matters 👉 Less work for browser 🧠 👉 Better responsiveness ⚡ 💡 “Performance is not just faster loading — it’s smarter execution.” #Frontend #JavaScript #WebPerformance #ReactJS #FrontendEngineering

🚀 JavaScript Project 3: Counter System Built a stste-driven counter with increment, decrement and reset actions —but this time, I focused on how engineers think, not just making it work. 🔑 Key ideas: • State is the single source of truth • UI updates are centralized ( updateUI ) • Event delegation for scalable interaction • Data-driven actions using data-* attributes • Clear UI feedback (disabled states, interaction response) 💡Biggest insight: Don't manipulate the UI directly — update state, then let the UI reflect it. 🔗 Live: https://lnkd.in/dTNy6A2M 💻 Code: https://lnkd.in/dp638D6h This is part of my journey building JavaScript systems step-by-step. More coming. #JavaScript #Frontend #WebDevelopment #LearningInPublic

I’ve used CSS-in-JS heavily in production systems. At small scale, it feels like a clear win scoped styles, dynamic props, no naming headaches. It improves developer experience in all the right ways. But at scale, the conversation changes. CSS-in-JS moves work into the runtime: -Styles are generated during render -Injected into the DOM repeatedly -Paid for during hydration, not build Individually, these costs look small. Together, they show up as slower renders, heavier pages, and harder to debug performance issues. What makes this tricky is that nothing “breaks.” The system just becomes gradually less efficient. That’s why many teams are quietly shifting, towards build-time extraction, utility first CSS, or zero runtime approaches. Not because CSS-in-JS is wrong but because the cost model doesn’t scale cleanly. As engineers, we don’t just choose tools based on DX. We choose them based on where the cost lands. And in this case, the cost lands on the user. Curious — at what scale did CSS-in-JS start becoming a problem for you? #FrontendEngineering #WebPerformance #SoftwareEngineering #CleanCode #ScalableSystems #JavaScript #ReactJS #CSS

Built a to-do app with a glassmorphic UI as a mini project. Kept it simple — vanilla HTML, CSS, and JS. No frameworks. A few things I learned along the way: — Local Storage API to persist tasks on refresh — DOM manipulation with vanilla JS — How CSS backdrop-filter actually works for the glass effect — JSON.stringify and JSON.parse for saving arrays Small project but learned a lot from it. More coming. repo link: https://lnkd.in/dEtj35Us #WebDev #JavaScript #Frontend #BuildInPublic

Just wrapped up a highly satisfying 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁 task: a fully playable 𝗠𝗲𝗺𝗼𝗿𝘆 𝗖𝗮𝗿𝗱 𝗚𝗮𝗺𝗲! 💻✨ As I progress through my 𝗜𝗧𝗜 𝗠𝗼𝗯𝗶𝗹𝗲 𝗖𝗿𝗼𝘀𝘀-𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 𝘁𝗿𝗮𝗰𝗸, I am focusing on writing 𝗰𝗹𝗲𝗮𝗻, 𝘀𝘁𝗿𝗼𝗻𝗴𝗹𝘆-𝘁𝘆𝗽𝗲𝗱 𝗢𝗯𝗷𝗲𝗰𝘁-𝗢𝗿𝗶𝗲𝗻𝘁𝗲𝗱 code. This project was the perfect playground to connect strict 𝗯𝗮𝗰𝗸𝗲𝗻𝗱-𝘀𝘁𝘆𝗹𝗲 logic with 𝗳𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗨𝗜. 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 & 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀: 🛠️ 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁: Heavily utilized Interfaces to define data structures and Classes (Game, Card, SoundManager) to handle states, matches, and the Fisher-Yates shuffle algorithm. 🏗️ 𝗛𝗧𝗠𝗟: Created a clean, semantic layout for the game board and progress tracking. 🎨 𝗖𝗦𝗦: Managed the grid layout and brought the cards to life using smooth, 3D CSS transforms and hover states. Mastering these strict OOP concepts and state management in TypeScript is the perfect stepping stone before diving into cross-platform mobile frameworks! https://lnkd.in/dUj-piVP #TypeScript #JavaScript #WebDev #SoftwareDeveloper #ITI #Coding #Frontend

🚀 Debounce vs Throttle in React (and when to use each) Handling user interactions efficiently is key to building performant applications — especially when dealing with frequent events like typing and scrolling. Here’s a simple breakdown: 🔹 Debounce • Delays execution until the user stops triggering the event • Best for: search inputs, API calls on typing 🔹 Throttle • Limits execution to once every fixed interval • Best for: scroll events, resize handlers ⚠️ Without control, frequent events can lead to: • Too many API calls • UI lag • Performance issues 📈 Results: • Reduced unnecessary API requests • Improved UI responsiveness • Better user experience 💡 Key takeaway: Use debounce when you want the final action, use throttle when you want continuous control. What scenarios have you used debounce or throttle in? #React #Frontend #WebDevelopment #Performance #JavaScript #NextJS

Level Up Your React Workflow in 2026 💻 The gap between a "good" and "great" developer often comes down to their tooling. After refining my setup this year, these are the extensions that have made the biggest impact on my React productivity: 1. The Logic & Refactoring Powerhouse VSCode React Refactor: Extracting JSX into a new component used to be a manual chore. This extension does it in two clicks. Error Lens: Instead of hovering over red squiggles, it prints the error message inline. Catch those dependency array issues in useEffect instantly. Console Ninja: Stop jumping between your editor and the browser. It displays console.log output and runtime errors directly in your IDE. 2. Visual & Styling Clarity Tailwind CSS IntelliSense: Essential if you’re in the Tailwind ecosystem. Autocomplete and class previews are lifesavers. Peacock: If you work on multiple React projects at once (e.g., a frontend and a backoffice), Peacock colors each window differently so you never push code to the wrong repo. Fluent Icons: Because a clean, recognizable file tree makes navigating large src folders significantly faster. 3. Beyond VS Code While VS Code is the standard, the landscape is shifting: Cursor: My current favorite. As a VS Code fork, it keeps your extensions but adds native AI integration that makes writing boilerplate React hooks feel like magic. WebStorm: For those who want "Everything Included." Its built-in refactoring for React (like renaming components across the entire project) is still the most robust in the game. The right tools don't just make you faster; they reduce the cognitive load so you can focus on solving actual problems. What does your .extensions folder look like? Anything I missed that I should try out? #SoftwareEngineering #ReactJS #JavaScript #Productivity #CodingLife #WebDev