Performance Monitor is an advanced tool in Windows 11 that provides detailed insights into system performance, allowing users to monitor resource usage in real-time. It offers various performance counters, including battery status and network adapter performance, and supports different visualization formats like line graphs and histograms. Users can display multiple graphs simultaneously and save specific settings as an HTML file for easier analysis. Additionally, Performance Monitor can generate detailed reports based on predefined Data Collector Sets, enabling tailored data collection for critical metrics such as CPU usage and processor interrupts. Users can access Performance Monitor via the Start menu or by typing "perfmon" in the Run dialog.