It looks like
ReactDefaultPerf found some places you could add
Keep in mind that just because there are lots of items in the table does not mean you need to add lots of
shouldComponentUpdate() methods. Instead, simply try adding one to the highest-ranked component in the table and re-running the perf test. Often you'll see that it takes care of the other components on the list automatically for you.
For more information about
shouldComponentUpdate() see http://facebook.github.io/react/docs/component-specs.html#updating-shouldcomponentupdate