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Depending on what OS (operating system) you are using. i will use windows for my answer. you can either press CTRL + ALT + DEL and select Task Manager from the list that appears. or you can right click on your task bar (the one at the bottom of your screen) and select task manager from there. once Task Manager is open navigate to the processes tab and then click the CPU to sort the list by descending order of CPU % if you are wanting to know this because the computer is running slow it might also be an idea to check how much memory it is using, by clicking on the memory normally located next to CPU.

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