This document introduces Sencha Touch 2, which focuses on improving performance. It summarizes that Sencha Touch 2 startup speeds and layout performance are significantly faster than previous versions and competitors' mobile browsers. It also provides a smoother user experience through improvements like flicker-free animations and scrolling fluidity. Sencha Touch 2 aims to iterate and innovate key features, refine and refactor code, and ensure consistency and quality through code reviews and other processes.