Building a high performance front end is a balancing act. You need to understand all the different moving parts and subsystems in the browser and how they interact with each other. Small changes can significantly impact page and app load time, memory consumption, and processor use which has a huge impact on your user’s experience! In this session, we will dive into the subsystems of the browser and learn to optimise performance on sites and in web apps. We will also deep dive into the new performance analysing tools in IE11 available expose good and bad run-time patterns for your sites and web apps, and provide users with a fast and fluid experience.