There are actually many reasons to get back the classic Task Manager.

  1. The new Task Manager is significantly slow. It consumes more memory and CPU. A task manager should use the most lightweight resources as possible, to enable to quickly start it in emergencies when some process is taking up all of the CPU or memory. The old Task Manager starts instantly without UAC elevation, the new one takes forever to load.
  2. The old Task Manager remembers the last active tab, the new one does not.
  3. The new Task Manager shows everything in groups such as apps, background processes and Windows processes. Even if Microsoft's intention here may have been to organize it better, if you need to quickly locate a particular app or process, it takes far more time now because now the user needs to search for it in each group.
  4. The new Task Manager requires UAC elevation when UAC level is set to highest. This is because it needs trace data from Event Tracing for Windows (ETW). The old Task Manager ran just fine without elevation to show current user processes.
  5. The old Task Manager could be set to run at startup, minimized and hidden so it would start up in the notification area (system tray). The new Task manager, even if it is set from Task Scheduler to run as admin but minimized at startup, it does not minimize properly to the tray.
  6. There is no global status bar visible in the new Task Manager regardless of the active tab, showing the total number of processes, CPU usage and physical memory and/or commit charge.
  7. The old Task Manager showed the application name from the title bar. The new one gets its name from somewhere else. The document name is only shown in More Details view after expanding by clicking the arrow/triangle. Suppose there are 10 windows of an app open and 1 of them stops responding. With the old Task Manager, it was one glance away. With the new one, I must expand the arrow of each window to see if the not responding document is under one of those.
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Old Task Manager for Windows 10