As the software world continues to shift to cloud based solutions, testing professionals are expected to provide answers to the new questions: * How quickly will the system respond? * How many machines (servers, load balancers, switches, etc.) do we need? * What happens when a machine (or a rack, cluster, data-center) fails? * What is the performance cost of a new feature? This session will introduce these topics and give examples for services most people are familiar with.