On the Processes tab, right-click the program you want to change, point to Set Priority, and then click the command you want.
To view the priority of running programs, on the Processes tab, on the View menu, click Select Columns. In the Select Columns dialog box, select the Base Priority check box, and then click OK.
Changing the priority of a process can make it run faster or slower (depending on whether you raise or lower the priority), but it can also adversely affect the performance of other processes.
End a program with Task Manager
End a process with Task Manager
Update Task Manager data
Change display options in Task Manager
Assign a process to a processor