I don't know that a 15 millisecond difference in rendering performance is going to matter to anyone =/ The memory usage is in megabytes too. It's not much. For sure React is slower on paper, but in most cases it's a non-issue. Nobody chooses React for its performance benefits anyway, but because of its huge ecosystem of libs and developers. In most cases it's fast enough.
I agree that React is fast enough for a lot of things without worrying too much about performance.
I've also worked on several apps where we had to work really really hard to get decent performance out of React and the resulting code was ugly and brittle.
