How does React Select handle lists of options that are very large?

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React Select handles large lists of options by implementing virtualization. Virtualization is a technique used to render only a subset of a large data set, while maintaining the appearance of a complete list. This improves performance by reducing the amount of data that needs to be rendered, ultimately resulting in faster load times and a more efficient user experience.

React Select uses a library called react-window to implement virtualization. This library provides reusable React components that can be used to render only the parts of the list that are currently visible. As the user scrolls through the list, new items are dynamically loaded and rendered on demand, reducing the amount of DOM manipulation that needs to be done.

In addition to virtualization, React Select also provides other features to handle large lists of options, such as the ability to filter and sort the list, and the ability to load options dynamically as the user types. These features help to further streamline the user experience, making it easier for users to quickly find the option they are looking for, even in a large list.