Hydration Slows Frontend Performance

21 Days 21 web dev procject Day 6 of Building in Public 🚀 live demo : https://lnkd.in/gYuw98q9 Today I focused on improving the UI and fixing issues in my React project. Worked on component structure, responsive layout, and debugging some annoying build errors. Things I learned today: • Proper component separation makes debugging easier • Small UI fixes can dramatically improve user experience • Build errors usually come from simple mistakes (wrong imports, wrong paths) Slow progress is still progress. #buildinpublic #webdevelopment #reactjs #javascript #100daysofcode

Vite 8 is officially here, and it’s arguably the most significant architectural shift in frontend tooling we’ve seen in years. 🚀 They’ve completely rewritten the rules by dropping the dual-bundler setup in favor of a single, Rust-powered engine. The performance benchmarks are absolutely insane. Swipe through to see why Vite 8 changes everything. 👉 Have you upgraded your projects yet? Let me know your build times below! 👇 #Vite #WebDevelopment #Frontend #JavaScript #Rust #SoftwareEngineering

React Rendering Flow — simplified 👇 Every UI update in React follows a structured process: ▪️ Trigger (state/props/event) ▪️ Virtual DOM creation ▪️ Diffing old vs new ▪️ Reconciliation ▪️ Efficient DOM update React doesn’t blindly update the DOM — it calculates the minimum changes needed. This is what makes React fast ⚡ Understanding this changed how I design components. What part of React internals do you find confusing? #React #FrontendDevelopment #WebDevelopment #JavaScript

Behind the Screen – #32 Do you know? In JavaScript, almost everything runs on a #SingleMainThread. The main thread is responsible for: 👉 Executing JavaScript code   👉 Updating the DOM   👉 Handling user interactions (clicks, inputs)   👉 Rendering the UI  Since there is only one #MainThread, it can do only one task at a time. If a heavy task runs on the main thread: 👉 The UI becomes unresponsive   👉 Clicks and inputs are delayed   👉 The page may feel frozen  That’s why long operations should not block the main thread. Modern apps try to: • Break tasks into smaller #chunks   • Use #asynchronous operations   • #Offload heavy work when possible  🔥 A smooth user experience depends on keeping the main thread free. #javascript #webdevelopment #frontend #performance #softwareengineering

Day 5 of my 7-Day Button Challenge 🚀 Today I built a Professional Theme Toggle Button 🌙☀️ This button lets users switch between Dark Mode and Light Mode while remembering the user's preference using localStorage. Even after refreshing the page, the selected theme stays the same. What I practiced while building this: • JavaScript DOM manipulation • UI state handling • Local Storage for persistence • Building small but useful UI interactions Small features like this are common in real-world web applications and improve the overall user experience. #javascript #webdevelopment #frontend #codingchallenge #buildinpublic

𝗠𝗼𝘀𝘁 𝗥𝗲𝗮𝗰𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 𝗢𝘃𝗲𝗿𝘂𝘀𝗲 𝘂𝘀𝗲𝗦𝘁𝗮𝘁𝗲 Not everything in React needs to be state. But many developers still store everything in useState. That leads to: • Unnecessary re-renders • Extra complexity • Harder-to-maintain components Here’s a simple way to think about it: 👉 If it affects the UI → use state 👉 If it doesn’t → use useRef useRef lets you store values across renders without triggering a re-render. This makes it perfect for things like: • Storing timers • Tracking previous values • Accessing DOM elements • Keeping mutable values Using state where a ref is enough is a common mistake. And over time, it impacts performance and code clarity. 👇 Simple comparison below Day 20/100 — sharing practical frontend engineering lessons. Do you usually default to state or think before choosing? #ReactJS #FrontendEngineering #JavaScript #WebDevelopment #SoftwareEngineering

Frontend development feels simple… until it doesn’t. At first, it’s just DOM updates and event handlers. But as the application grows: – state spreads everywhere – UI becomes harder to reason about – small changes break unrelated parts And suddenly, complexity takes over. Scalability in frontend is not about performance first. It’s about structure. This is part of a series where I break down how modern JavaScript frameworks are designed and built to handle scale. 👉 Full article in the comments #frontend #javascript #softwarearchitecture

useState vs useRef in React | Best Practices for Better Performance useState → Used to store state that updates the UI and causes component re-render. useRef → Used to store mutable values that persist between renders without causing re-render. useState is best when the value change should reflect on the screen. useRef is best when you need to keep a value without affecting rendering, such as DOM access, timers, or previous values. Using useState everywhere can cause unnecessary re-renders, while using useRef correctly helps improve performance in large React applications. Rule: If UI changes → useState If UI does not change → useRef #ReactJS #JavaScript #FrontendDevelopment #ReactHooks #MERNStack #SoftwareEngineering #WebDevelopment

🧑💻 Stop Chasing Frameworks. Master Fundamentals. React today. Something else tomorrow. But: • JavaScript • Rendering • Browser behavior These stay. 🎯 Action Tip: Deep dive into browser internals. Takeaway: Fundamentals outlive trends. Stay tuned for more updates and insights on the latest trends in frontend development! #FrontendGrowth #JavaScript #WebFundamentals #DeveloperLife

Ever wondered why changing one small thing in React doesn’t re-render the entire UI? 🤔 That’s reconciliation. In React, every update creates a new virtual DOM. But instead of updating everything, React compares the new tree with the previous one - and updates only what changed. Sounds simple, but small mistakes can break performance. 😬 • Missing or unstable keys ➡️ unnecessary re-renders • Recreating objects/functions ➡️ diffing becomes expensive • Large component trees ➡️ slower updates React is fast. But only if we help it. Reconciliation is not magic - it’s an optimization strategy based on assumptions. Understanding it changes how you structure components. 😉 Have you ever fixed a performance issue just by adding proper keys or memoization? #reactjs #frontend #webperformance #javascript #learninginpublic