react-window
React components for efficiently rendering large, scrollable lists and tabular data
react-virtuoso
<img src="https://user-images.githubusercontent.com/13347/101237112-ec4c6000-36de-11eb-936d-4b6b7ec94976.png" width="229" />
svelte-inview
A Svelte action that monitors an element enters or leaves the viewport or a parent element. Performant and efficient thanks to using Intersection Observer under the hood.