It's a bit verbose to run our benchmark script now and I'm thinking about ways to make it easier (open to better ideas).

./scripts/bench/benchmark-runner [--dev]

It takes bundles from your local build folder and compares them with React's latest master build (from http://react.zpao.com/builds/master/latest/). Notice that it doesn't build React by default; you can run npm run build manually before invoking the benchmark runner (like npm run build && ./scripts/bench/benchmark-runner).

cc @spicyj @gaearon @zpao