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In Task Manager, click on the Performance tab, then click "Open Resource Monitor" at the bottom.
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To start it, first open Task Manager (Ctrl+Alt+Delete -> Task Manager). Windows' Resource Monitor tool is something that every user should be familiar with. If your computer is legitimately slow and you actually want to fix it, learn how to diagnose problems based on the actual indicators of performance issues, which you can find built into the system.
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