𝗥𝗲𝗮𝗰𝘁 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 👋 Stop wasting renders with React.memo 𝗧𝗛𝗘 𝗣𝗥𝗢𝗕𝗟𝗘𝗠: Every time you click the button, the parent re-renders. Without React.memo, the child component re-renders too — even though its data never changed. 𝗥𝗲𝘀𝘂𝗹𝘁: Unnecessary re-renders that hurt performance. 𝗧𝗛𝗘 𝗦𝗢𝗟𝗨𝗧𝗜𝗢𝗡: Wrap your component with ✌𝐑𝐞𝐚𝐜𝐭.𝐦𝐞𝐦𝐨()✌ Now when the button clicks: ✓ Parent re-renders ✓ Child component checks its props ✓ Props unchanged? Skip the re-render One line of code prevents expensive, unnecessary renders. BEST FOR: Charts and data visualizations, complex UI components, components that render frequently, and performance-critical sections. 𝙎𝙢𝙖𝙧𝙩 𝙧𝙚𝙣𝙙𝙚𝙧𝙞𝙣𝙜 = 𝙛𝙖𝙨𝙩𝙚𝙧 𝙖𝙥𝙥𝙨 💡 #ReactJS #JavaScript #WebDevelopment #Frontend #ReactHooks #Programming #Coding #SoftwareEngineering #WebDev #ReactDeveloper #FrontendDevelopment #ReactTips #DevTips #CodeOptimization #Performance #FullStack #TechTips #LearnReact #100DaysOfCode #DeveloperCommunity #TechCommunity #SoftwareDeveloper #WebDesign #UI #UX
It also depends on the type of props being passed. React.memo performs a shallow comparison, so primitive values usually work fine. But if objects, arrays, or functions are passed, they may cause re-renders because their references change. In such cases, useCallback (for functions) or useMemo (for objects/arrays) can help stabilize references.
Solid tip 👍 Optimizing renders early in development really helps when the app scales performance-focused posts like this are gold
Nice post! But what if we pass a callback function as a prop? Without useCallback in the parent?
When I first worked with react, I couldn't understand the purpose of constantly re-rendering components. When I learned about .memo, I had wondered when it wasn't the default behavior and there wasn't an exception to aggressively re-render components.
Informative
React 19 automatically doing this.