In this talk, we will explore the importance of performance optimization in mobile app development and discuss common performance bottlenecks that can lead to issues such as ANRs and frame drops. We will then look into approaches to identify and address these issues. Attendees will learn best practices for optimizing UI rendering, data processing, memory management, as well as strategies for measuring the impact of micro-optimizations on app performance and perceived performance for users. The presentation will show (adapted) real-world examples of micro-optimizations, and their impact on a global userbase. By the end of this talk, attendees will have a solid understanding of how to identify and address performance issues in their own Android apps, leading to faster, more responsive and more engaging user experiences.