Data Virtualization

When we need to work with large datasets in React, such as large lists, we can run into problems with initial render time and memory usage.

Data virtualization is an approach for improving the performance of applications in those cases. It typically uses a technique called "windowing" or "viewport rendering". Instead of rendering the entire list/grid at once, only a small subset (or "viewport") of items is rendered based on the current scroll position or viewport size.

react-virtualized is a feature-rich library, providing a variety of components and utilities for virtualizing large lists, tables, and grids.

import React from 'react';
import { List } from 'react-virtualized';

const rowRenderer = ({ index, key, style }) => (
  <div key={key} style={style}>
    Row {index}
  </div>
);

const App = () => (
  <List
    width={300}
    height={150}
    rowCount={1000}
    rowHeight={35}
    rowRenderer={rowRenderer}
  />
);

export default App;