Before you surface your web app through a mobile marketplace, you should be aware of common errors and performance tips to optimize your web app for mobile devices. This session teaches you the important things you need to know, like the best practices around improving frame rate and ways to optimize . We also help you avoid mistakes, such as common cases that kill scrolling performance. Through a case study, we dive deep into the subtleties of CSS animations and improving rendering speed by reducing composite layers in your web apps. We also show you how to profile performance bottlenecks on-device using the Web App Tester tool. You get a peek into the Chromium-based web runtime on Kindle Fire devices and learn how to accommodate device rotation, touch feedback, device resolution, and screen aspect ratios to fine-tune your web app experience on mobile devices.