How did you optimize the display of a large list of records, what did you apply?

To optimize the display of a large list of records, I usually apply the following approaches:

• Virtualization (virtual scroll) — only the elements visible on the screen are rendered, and the rest are not created in the DOM. This significantly reduces the load on the browser. Libraries: react-window, react-virtualized.

• Pagination — I split the list into pages and load/display only the current page.

• Lazy loading — I load data as the user scrolls (infinite scroll).

• Render optimization — memoization of components, using keys to avoid unnecessary re-renders.

Example with react-window:

import { FixedSizeList as List } from 'react-window';

const Row = ({ index, style }) => (
  <div style={style}>Element #{index}</div>
);

<List
  height={500}
  itemCount={10000}
  itemSize={35}
  width={300}
/>

This approach allows efficient handling of very large lists without lag.