Chapter 1 What’s New for FortiOS 5.2.1 : System Features : CPU and Memory Usage per VDOM
  
CPU and Memory Usage per VDOM
In FortiOS 5.2, the following information sources are available concerning both CPU and memory usage per VDOM:
Default columns for CPU and Memory have been added to the VDOM list.
Optional columns for Sessions and New Sessions per Second have been added to the VDOM list.
A summary line has been added to at the bottom of the VDOM list to show global CPU, memory, sessions, and sessions per second usage.
The CLI command diagnose system vd stats has been added to display VDOM statistics.
VDOM list