Most efficient way to retrieve a count of vms in an org?

Hi everyone, What is the most efficient way to retrieve a count vms in an org. I am currently retrieving all vdcs in an org, then all vApps, then all vms, and pushing them to an array, then doing a vms.length on the array populated by all vms.

This takes a horrendous amount of time, and there MUST be a better way.

Open to any suggestions. Thank you