Instabug's Flutter APM tool helps developers track key metrics to improve their app's performance, including Apdex scores, UI hangs, network timeouts and issues, slow launches, tracking custom traces. The app Apdex score provides a single numerical representation of the app's performance, allowing teams to align around one KPI and communicate it to stakeholders. Instabug APM also monitors UI hangs, which can cause users to abandon an app if they experience unresponsive interfaces, and network performance issues that can impact user experience. Additionally, the tool tracks execution traces, which measure how long client-side logic takes to complete, and app launches, providing insights into the first gate users face when interacting with the app. By combining Instabug's 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.