Optimization of rendering large lists (100,000 items)

To optimize rendering of large lists (for example, 100,000 items) on the frontend, several approaches are used:

• Virtualization (virtual scroll): display only the elements visible to the user in the DOM, loading others as the user scrolls. This significantly reduces the load on the browser.

• Pagination: divide the list into pages and load/render them in parts.

• Component rendering optimization: use memoization, PureComponent (in React), avoid unnecessary re-renders.

• Using Web Workers: for heavy computations outside the main UI thread.

Example of virtualization using React-window:

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

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

const LargeList = () => (
  <List
    height={500}
    itemCount={100000}
    itemSize={35}
    width={300}
  >
    {Row}
  </List>
);

This approach allows efficient handling of huge lists without interface lag.