Instabug's APM tool helps developers monitor key metrics to improve their app's performance, including Apdex scores, UI hangs, network timeouts and issues, slow launches, tracking custom traces, and more. The tool provides a single numerical representation of an app's performance through the Apdex score, which can be tracked over time and across versions. It also helps identify UI hangs by comparing response times to user input and screen time. Additionally, Instabug tracks network performance, execution traces, and app launches, providing insights into app stability, crashes, and bugs. By combining APM with Crash Reporting and Bug Reporting, developers can gain a complete picture of their app's quality, performance, and stability, ultimately delivering the fastest and most reliable experience for users.