With millions of apps on various app stores, standing out takes significant technical effort. App performance directly affects users' satisfaction and experience, impacting key business metrics like downloads, usage, retention, and revenue. Application Performance Management (APM) is the monitoring and management of key app performance indicators, aiming to diagnose and solve problems in relation to how an app performs. APM looks at the whole picture, considering infrastructure resources, deployment, and data collection, including status and health of the application, dependency maps, and performance metrics. By tracking app performance metrics, developers can make targeted speed enhancements and improve their app quality before negative user reviews. Key areas to focus on include app launch, UI hangs, network performance, app traces, and Apdex scores, which help understand how an app is performing overall. Using an App Performance Monitoring tool helps stay on top of app performance, track key metrics, and act proactively to find problem areas, with tools like Instabug providing a complete picture of app quality, performance, and stability.