-1 no visualization

-1 seems like the author didn't use EM-friendly sleeps & http clients when appropriate.

-1 not clear if the author used a separate, in-DC machine for load testing or his laptop, and what the CPU looked like on the test machines during those tests. If they're sitting idle at 20% usage because RTT between your desk and EC2, that's not a great test. Additionally, it takes some sysctl tuning to really make OSX able to run a decent number of requests/s necessary for load testing of any type.