I’m running a Citrix Netscaler VPX in my lab, and I just noticed that even though there is no connection, the CPU usage for this VPX is 100%.
You can change this behavior by doing the following:
On the left, go to System > Settings.
On the right, in the bottom of the second column, click Change VPX Configuration Settings.
Change the CPU Yield drop-down to YES, and click OK.
After making this change, you can see an immediate drop-off in CPU consumption.