👀 Views: 32 💬 Answers: 1 📅 Created: 2025-06-15

react performance memoization javascript

I've been working on this all day and I've hit a wall trying to Quick question that's been bugging me - I'm dealing with I'm sure I'm missing something obvious here, but Hey everyone, I'm running into an issue that's driving me crazy... I'm encountering performance issues when passing complex objects as props to child components in React 18. I am using `React.memo` to optimize rendering, but it seems that my components are still re-rendering unnecessarily when the parent updates. Here’s a simplified version of my code: ```javascript const ParentComponent = () => { const [count, setCount] = useState(0); const complexObject = { data: [1, 2, 3], timestamp: Date.now() }; // complex object return ( <div> <button onClick={() => setCount(count + 1)}>Increment</button> <ChildComponent complexProp={complexObject} /> </div> ); }; const ChildComponent = React.memo(({ complexProp }) => { console.log('ChildComponent rendered'); return <div>{JSON.stringify(complexProp)}</div>; }); ``` I expected `ChildComponent` to only re-render when `complexProp` changes, but it re-renders every time I click the button in `ParentComponent`. I’ve tried wrapping `complexObject` in `useMemo` and `useCallback`, but the behavior remains the same: ```javascript const memoizedComplexObject = useMemo(() => ({ data: [1, 2, 3], timestamp: Date.now() }), []); ``` Even with `memoizedComplexObject`, `ChildComponent` is still rendered on every `count` update. Is there a way to ensure that `ChildComponent` only re-renders when the contents of `complexObject` change? I've also considered using a library like `immer` for immutability, but I'm not sure if it will solve this issue. Any advice would be greatly appreciated! This is part of a larger service I'm building. What am I doing wrong? The project is a application built with Javascript. What would be the recommended way to handle this? What would be the recommended way to handle this? For context: I'm using Javascript on Debian. Any help would be greatly appreciated! For reference, this is a production service. For reference, this is a production desktop app. Is this even possible?