I'd like to hear more about performance issues in large apps. Some of the other virtual dom libraries, namely Mithril and Mercury do not have an equivalent to shouldComponentUpdate. I'm wondering how those perform in large apps.
Performance was not an issue throughout the project, even with complex components like data grids. The rendering is negligible next to things like acquiring data from the backend, that's where most of the optimization went (caching, loading resources upfront, etc). React just makes it a no-brainer.