The only way to accurately see how your website performs on heavy load, spiky usage, and with different web browsers and platforms is to do load and UI testing. This session explains how Amazon.com uses Amazon EC2 to do automated UI testing, at scale. We also cover using a variety of open source and commercial load and performance testing tools. These tools help you identify weak points in your web architecture, fix them, and ensure that your website can scale to the demand of your users. This session shows DevOps engineers, systems administrators, software developers, QA specialists, and front-end developers how to use tools and services like Amazon CloudWatch, Selenium, Siege, Bees with Machine Guns, and New Relic to load test their websites and applications running on AWS, and achieve desired levels of performance.