bvaughn/react-virtualized ? reverse-engineered prompt

Build me a React library for efficiently showing huge lists and tables without slowing the browser down.

I want it to let me render long scrollable lists, grids, and tabular data by only drawing what’s visible on screen, so it stays fast even with thousands of rows. Include a simple demo page where I can try a few examples, like a basic list, a table with columns, and a grid view, and make the scrolling feel smooth. Keep the API easy to use for a normal React app, and make sure it works well with different row sizes and window resizing.

If you need to check the latest React guidance or browser behavior, look up current docs online. Please also include clear setup and run instructions so I can try it locally right away.