Performance concerns with nested loops in React on large datasets - seeking optimization strategies
I'm converting an old project and I need help solving I'm upgrading from an older version and I've searched everywhere and can't find a clear answer..... I'm working on a personal project and While refactoring a component in my React application, I noticed that rendering a list of items with nested loops is causing significant performance issues, especially when dealing with datasets of 10,000+ elements. The current implementation utilizes a simple nested loop for rendering child components, which seems to be bogging down the application. Here’s a simplified version of the code: ```javascript const ParentComponent = ({ items }) => { return ( <div> {items.map((item) => ( <ChildComponent key={item.id} item={item}> {item.subItems.map((subItem) => ( <SubChildComponent key={subItem.id} subItem={subItem} /> ))} </ChildComponent> ))} </div> ); }; ``` After profiling the application using Chrome DevTools, I observed that the rendering time spikes significantly due to the nested loops. I’ve experimented with several strategies, such as using memoization with React’s `React.memo()` and `useMemo()`, but these haven’t yielded significant improvements. Here’s an example of my memoization attempt: ```javascript const ChildComponent = React.memo(({ item, children }) => { return ( <div>{/* Render item details */}</div> ); }); ``` Additionally, I researched using libraries like `react-window` for virtualized lists, which can render only the visible items, but I haven’t integrated that yet. Given the scale of the data, I’m looking for more effective optimization patterns. Could anyone provide insights into best practices for handling large datasets in React, particularly when dealing with nested loops? Are there specific design patterns or libraries that could help alleviate these performance issues? Any tips or code examples would be greatly appreciated! My development environment is Ubuntu. Am I missing something obvious? What am I doing wrong? For context: I'm using Javascript on Windows 11. Has anyone dealt with something similar? Thanks for taking the time to read this! This issue appeared after updating to Javascript 3.10. What would be the recommended way to handle this?