Accumulator Optimization

Per an r/sysadmin thread, u/poshftw recommends replacing the += for-loop accumulator pattern with an array sub-expression operator. For example, replacing

    $VMs = Get-VM
    $VMCount = "Retrieved $VMs.count from vCenter"
    Write-Verbose $VMCount
    $vCenterPersistentIDs = @()
    foreach ($VM in $VMs) {
        $vCenterPersistentIDs += $VM.PersistentID
    }

with

$vCenterPersistentIDs = @(Get-View -ViewType VirtualMachine -Property 'Config.InstanceUUid').Config.InstanceUuid

should bring a significant performance improvement.