Task Manager is designed for regular users, while Performance Monitor is for technical users who want to monitor their system and collect information in a log for later analysis.
To open the Performance Monitor in Windows 11, press Windows key + R, type perfmon, and click OK.
To generate a system performance report in Windows 11 using Performance Monitor, open the app, expand Data Collector Sets, choose System Performance, start the process, and view the generated report under Reports > System > System Performance.
The System Performance report includes diagnostic details about disk, network, CPU, memory, and other system resources; Performance Monitor can also be used to check crash logs and more on Windows 11.