Perfgraph 

Perfgraph is a cross-platform application that gives a graphical representation of the CPU, Memory and Network utilization. It can monitor in real-time the CPU (up to 8 cores) and Memory (Paging file and Physical memory) load on the computer, Network throughput via SNMP, Round-trip ping times to another host and Hardware sensors. The program runs within the explorer.exe process. Choose an activity you want to be monitored, refresh rate (from 1/50th of a second to every hour), and Perfgraph will draw a graph. Also you can add a text label and specify the label’s font. You can make all settings using the “Perfgraph Configuration” window. Double-click on the Perfgraph Toolbar and you will access it.

After the installation process Perfgraph will be placed on the Toolbar. Perfgraph allows you to monitor and display several processes simultaneously. So if there is much space on your Toolbar, you can add some more Perfgraph Instances and also enlarge your graphs. Besides, you can place the graph on the desktop by simply dragging it there.