The Windows 8 Task Manager
has been significantly improved over previous versions of
Windows. Some of the new changes include showing a total percent
usage at the top of your Processes, which makes it easier to
determine total memory and CPU usage, improved Performance
graphs, a Startup tab to see startup processes and their impact
to system performance, and the App history tab (as shown below)
that gives you the total resources an app has used over a period
of time. Press Ctrl + Shift + Esc to start exploring the
new Task Manager.