Optimize PowerShell Script (VMWare)

Hello,

I have created this PowerShell Script to an Inventory of Virtual Machine from vCenters, Script works just fine However it take very long time to provide the output I have around 5 vCenters and takes about couple of hours sometime more to give the output.

Can anyone help me to Optimize this Script so that i can get output faster

Import-Module VMware.VimAutomation.Core

#Location of the OutPut File
    $outputfile = "D:\AllvCenterVMs_$(get-date -f MM-dd-yyyy).csv"

#List all vCenters here
    $AllVCenters = ("vCenter1, vCenter2, vCenter3, vCenter4" )

#Provide User Name
   $vuser = "<AccountName>"
#Provide Pwd
   $vpass = "<Password Here>"
#Connect to All vCenters
    Connect-VIServer $AllVCenters -user $vuser -password $vpass

    $output = @()
$vms = Get-Vm

foreach($vm in $vms){
$vminfo = "" | Select vCenter, DataCenter, Cluster, Host, VMName, DNSName, IPAddres, OS, PowerState, vCPU, vRAM, ProvisionedDiskGB, UsedDiskGB, Datastore, ToolsStatus, ToolsVersion, AppName, Owner, AppAdmin, Environment, Notes
$vmview = Get-VM $vm.Name | Get-View

# Calculation for Provisioned Disk
    $ProvisionedDisk = [math]::round($vm.ProvisionedSpaceGB)
    $ProvisionedDisk =$ProvisionedDisk.ToString() 

# Calucation for Used Disk
    $UsedDisk = [math]::round($vm.UsedSpaceGB)
    $UsedDisk =$UsedDisk.ToString() 

            $vminfo.vCenter = $vm.Uid.Substring($vm.Uid.IndexOf('@')+1).Split(":")[0]
            $vminfo.DataCenter = Get-Datacenter -VMHost $vm.VMHost
            $vminfo.Host = $vm.VMHost
            $vminfo.Cluster = get-cluster -VM $vm.Name
            $vminfo.VMName = $vm.Name
	        $vminfo.DNSName = $vm.Guest.HostName
            $vminfo.IPAddres = $vm.Guest.IPAddress[0]
            $vminfo.OS = $vm.Guest.OSFullName
            $vminfo.PowerState = $vm.PowerState
            $vminfo.vCPU = $vm.NumCpu
	    $vminfo.vRAM = $vm.MemoryGB.ToString()
            $vminfo.ProvisionedDiskGB = $ProvisionedDisk
	    $vminfo.UsedDiskGB = $UsedDisk
            $vminfo.Datastore = Get-Datastore -Id $vm.DatastoreIdList
            $vminfo.ToolsStatus = $vmview.Guest.ToolsStatus
            $vminfo.ToolsVersion = $vm.Guest.ToolsVersion
            $vminfo.AppName = (Get-Annotation -Entity $vm -CustomAttribute AppName).Value
            $vminfo.Owner = (Get-Annotation -Entity $vm -CustomAttribute Owner).Value
            $vminfo.AppAdmin = (Get-Annotation -Entity $vm -CustomAttribute AppAdmin).Value
            $vminfo.Environment = (Get-Annotation -Entity $vm -CustomAttribute Environment).Value
            $vminfo.Notes = $vm.notes
	        $output += $vminfo
}

# To Get OutPut in CSV format
        $output | Export-Csv $outputfile -noTypeInformation

# To Get OutPut on PowerShell Grid
      # $output | out-gridview 

#Disconnectin the vCenters sessions
        Disconnect-VIServer $AllVCenters -Force -Confirm:$false

Nikhil Gupta