Utilization Discrepancy

Hello NFA!

I have an evaluation version of NFA v 5. I think I'm experienceing an Id10t error. (jk) Perhaps you can clarify for me.

I am running NetFlow on my Gigabit interface 0/0. NFA shows a utilization that is the same as what the router displays. I happened to look at the sh ip flow export command and noticed that the interface was dropping packets due to "IPC rate limiting". So this brings me to two questions.

What does this mean exactly?
If this does mean that i'm loosing NetFlow Packets on the interface how can i be displaying the correct utilization? Does NFA use some other means to display Utilization?

Thank you for the help and clarification.

Warm regards!