Single connection for multiple Get-WmiObject calls

Question

The script below successfully obtains the manufacturer, model, serial number, and operating system from each computer I provide in hostnames.txt. However, it is slow because it must connect to WMI on each computer three times.

$OS = Get-WmiObject Win32_OperatingSystem -ComputerName $Computer
$CS = Get-WmiObject Win32_ComputerSystem -ComputerName $Computer
$BIOS = Get-WmiObject Win32_Bios -ComputerName $Computer

Using PowerShell, how can I connect to the remote-computer's WMI once and execute the three queries using the same connection?

$Array = @() ## Create Array to hold the Data
$Computers = Get-Content -Path .\hostnames.txt

foreach ($Computer in $Computers)
{

    $Result = "" | Select HostPS,Mfg,Model,Serial,OS

    $Result.HostPS = $Computer
    $ErrorActionPreference = "SilentlyContinue" ## Don't output errors for offline computers
    $OS = Get-WmiObject Win32_OperatingSystem -ComputerName $Computer

    $CS = Get-WmiObject Win32_ComputerSystem -ComputerName $Computer

    $BIOS = Get-WmiObject Win32_Bios -ComputerName $Computer
    $ErrorActionPreference = "Continue"

    $Result.Mfg = $CS.Manufacturer
    $Result.Model = $CS.Model
    $Result.Serial = $BIOS.SerialNumber
    $Result.OS = $OS.Caption

    $Array += $Result ## Add the data to the array
}

$Array | Export-Csv file.csv -NoTypeInformation

Answer 1

You can use CIM (which has a session option), more on CIM vs WMI ("WMI is the Microsoft implementation of CIM for the Windows platform")

$CIMSession = New-CimSession -ComputerName $RemoteComputer

Get-CimInstance win32_OperatingSystem -CimSession $CIMSession -Property Caption
Get-CimInstance Win32_ComputerSystem -CimSession $CIMSession -Property Manufacturer,Model
Get-CimInstance Win32_Bios -CimSession $CIMSession -Property SerialNumber