Big web properties like these tend to be developed by huge teams and tend to prioritize features over performance. It's partly Conway's law and partly the resu

Big web properties like these tend to be developed by huge teams and tend to prioritize features over performance. It's partly Conway's law and partly the result of having lots of users and features being easier to add than take away. None of these things really have much to do with React. If your app was going to be slow anyway, React won't help you. However, like Angular, React makes it easier to break things down into components and work on them separately, so it's popular with the same big teams that make bulky and slow web pages, just like Angular was before it. Correlation, not causation. Unlike Angular, React is also fantastic for small teams making lean pages that load blazing fast, which is why it's become so popular so quickly.