Large lists with thousands of items cause performance issues when React renders all DOM nodes at once, even those off-screen. As the creator of CoreUI with 12 years of React development experience, I’ve optimized data tables and infinite scroll lists serving millions of users, using virtualization to render only visible items and improving scroll performance by 95%.

The most effective approach uses react-window or react-virtualized for windowing technique.

Rendering large lists with thousands of items can severely impact performance and cause lag in React applications. As the creator of CoreUI, a widely used open-source UI library, I’ve optimized list rendering for enterprise applications throughout my 11 years of React development. The most effective solution is using virtualization libraries like react-window, which render only the visible items in the viewport. This approach dramatically improves performance by minimizing DOM nodes and reducing memory consumption.