03/15/2025
Ever felt like your frontend app is slower than it should be? Let’s talk about some common performance pitfalls and how to fix them! 🧵👇
1/ 🚀 Re-renders are killing your performance
If your React app feels sluggish, check unnecessary re-renders. Use React.memo, useMemo, and useCallback wisely.
2/ 🎨 CSS matters!
Avoid heavy selectors (div div div), prefer class over id, and use CSS containment (contain property) to improve paint times.
3/ 🌍 Reduce unnecessary network requests
Batch API calls, use useSWR or React Query, and implement caching to prevent fetching the same data repeatedly.
4/ 📦 Optimize bundle size
Tree-shaking, lazy loading (React.lazy & Suspense), and code-splitting can drastically improve load times.
5/ 📸 Images can make or break performance
Use modern formats like WebP/AVIF, optimize sizes, and use srcset for responsive loading.
6/ 🎭 Reduce layout shifts
Use proper width and height for images, avoid dynamically injected content above the fold, and use font-display: swap for better CLS scores.
7/ 🔥 Fast UI feels smoother
Use debouncing/throttling for event handlers, minimize DOM updates, and prefer CSS animations over JS-based ones.
8/ 🛠 Tools to help:
• Lighthouse for audits
• React DevTools for renders
• WebPageTest for deep analysis
9/ 🔄 Final tip: Measure before optimizing! Use performance.now(), Profiler API, and browser dev tools to find real bottlenecks.
Which of these do you struggle with the most? Let’s discuss! 🚀👇
