This is because it needs trace data from Event Tracing for Windows (ETW). The new Task Manager requires UAC elevation when UAC level is set to highest.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. The new Task Manager shows everything in groups such as apps, background processes and Windows processes.The old Task Manager remembers the last active tab, the new one does not.The old Task Manager starts instantly without UAC elevation, the new one takes forever to load. 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 new Task Manager is significantly slow.There are actually many reasons to get back the classic Task Manager.
