Apdex is an open standard for measuring the performance of software applications, providing a universal score between 0 and 1 that represents the overall user experience with an app. The 95th percentile (P95) measures outliers in app performance, allowing teams to identify exceptional instances and understand how their app is performing on average. Throughput tracks the number of users and changes over time, while app stability measures crashes per session or user. App loading times assess wait times for launch, screen transitions, and content loading, with specific targets for cold, warm, and hot app launch times. Network response time is crucial, aiming to respond to user requests within 1 second, and app trace completion time examines client-side logic execution time. UI response times monitor the responsiveness of the app's user interface, while screen loading times track page transitions and content loading stages. A proactive app performance management strategy involves monitoring metrics, quality control measures, and proactive tools like Instabug to ensure a competitive app experience.