vRealize, vRO: How to get the current VM CPU? overallCpuUsage always showing 0 MHz

I´ve been doing stuff with vRO + NSX, and while most of the stuff is working great, I havent found a way to get the VM runtime info correctly.

This is a call I´m using:

inputVM.summary.quickStats.overallCpuUsage;

But when I bring up a new Linux, or Windows, and it´s been 3 days - I still always get 0 MHz... Any ideas wht I´m doing wrong?