Introduction / Hook

Imagine a ride-hailing dashboard with thousands of live requests per second — without the right front-end strategies, users won’t even wait one second!

In this post, I’ll share advanced techniques to improve performance, UX, and security in real-world projects, along with working code examples.

1️⃣ Performance & Speed Boost

Techniques:

Code Splitting + Dynamic Imports: Load only necessary components.

Lazy Loading Components & Images: Improve initial render speed.

Service Workers & Cache API: Offline-first experience.

Web Vitals (LCP, FID, CLS): Track real user experience.

Code Example: Dynamic Imports + Lazy Loading in Next.js

// components/HeavyChart.js import { LineChart } from 'recharts'; const HeavyChart = ({ data }) => <LineChart data={data} />; export default HeavyChart; // pages/dashboard.js import dynamic from 'next/dynamic'; const HeavyChart = dynamic(() => import('../components/HeavyChart'), { ssr: false, loading: () => <p>Loading chart...</p> }); export default function Dashboard({ data }) { return ( <div> <h1>Dashboard</h1> <HeavyChart data={data} /> </div> ); } 

Result: Initial load is faster, heavy components load only when needed.

2️⃣ UX Enhancements

Techniques:

Skeleton Loading: Improve perceived speed.

Optimistic UI Updates: Use React Query or SWR for instant feedback.

Micro-Interactions: Framer Motion / Lottie for lively UI.

Code Example: Skeleton Loading & Optimistic UI

import { useQuery, useMutation, useQueryClient } from 'react-query'; import Skeleton from 'react-loading-skeleton'; export default function UserBalance() { const queryClient = useQueryClient(); const { data, isLoading } = useQuery('balance', fetchBalance); const mutation = useMutation(updateBalance, { onMutate: async (newBalance) => { await queryClient.cancelQueries('balance'); const previous = queryClient.getQueryData('balance'); queryClient.setQueryData('balance', newBalance); return { previous }; }, onError: (err, newBalance, context) => { queryClient.setQueryData('balance', context.previous); }, onSettled: () => { queryClient.invalidateQueries('balance'); }, }); if (isLoading) return <Skeleton height={30} width={100} />; return ( <div> <p>Balance: ${data}</p> <button onClick={() => mutation.mutate(data + 10)}>Add $10</button> </div> ); } 

Result: Instant feedback for users; loading feels smooth.

3️⃣ Advanced Security in Front-End

Techniques:

Content Security Policy (CSP)

Subresource Integrity (SRI)

Secure HTTP Headers with Helmet.js

Input Sanitization before sending data to API

Code Example: Helmet + CSP in Next.js

// next.config.js const securityHeaders = [ { key: 'Content-Security-Policy', value: "default-src 'self'; script-src 'self'; object-src 'none';" }, { key: 'X-Content-Type-Options', value: 'nosniff' }, { key: 'X-Frame-Options', value: 'DENY' }, ]; module.exports = { async headers() { return [ { source: '/(.*)', headers: securityHeaders, }, ]; }, }; 

Input Sanitization Example

import DOMPurify from 'dompurify'; const cleanInput = DOMPurify.sanitize(userInput); 

Result: Reduced XSS and injection attack vectors.

4️⃣ Tools & Workflow

React Profiler & Lighthouse CI: Track performance continuously

Framer Motion & Lottie: Improve UI interactions

React Query / SWR: Efficient data fetching & caching

Helmet.js + CSP: Front-end security headers

What are your favorite front-end techniques to improve speed, UX, and security in real-time apps? Share tools, tricks, or code that actually works! 👇

github repo : https://github.com/ariansj01/frontend-performance-optimization/tree/master

Frontend #ReactJS #NextJS #WebPerformance #UXDesign #Security #ReactQuery #SWR #WebDev #Optimization #DevTips #RealTime