"Task Manager provides information about programs and processes running on your computer. It also displays the most commonly used performance measures for processes."
Depending on your Windows version, you can press Ctrl+Alt+Delete to bring up Task Manager directly or through another screen.
You can also use Start > Run... taskmgr to start Task Manager but Ctrl+Alt+Del will work even if the Start menu is not responding.
The Process tab of the Task Manager is what we are currently interested in. It displays all the processes running on the computer, who is running it and how much of the system resources each is using. The CPU column indicates what percentage of the CPU is kept busy by the processes. The Mem Usage column indicates what amount of memory is currently allocated to each process.
To find out which processes are taking considerable amount of CPU, click on the CPU header.
The list is now sorted in the order of CPU utilisation. Clicking it again switches between ascending order and descending order. If you are an ordinary order, the System Idle Process will have the largest percentage of CPU time - it means that your CPU is idle for that percentage of time.
To find out how much memory the processes are utilising, you have to click on the Mem Usage header. The list becomes sorted using the Mem Usage numbers now. You can switch between ascending and descending order by clicking on it again.
You can use this utility to figure out what application is keeping the CPU busy or taking up too much memory. You can decide to close unwanted applications or uninstall them too.
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