Run Parallel jobs power shell - powershell

Question

Hello PowerShell gurus
I made this script to get the latest KB patch installed on a remote PC. And its now working. AL though its crude and something I just put together (while learning PS). It gets the job done… Painfully slow but works. It takes over 2:40 hrs to run and check 128 PCs. I saw in other posts that creating parallels jobs for this might help. I have no idea on how to create parallel jobs please help me.
my script
Start-Transcript -Path "$(Get-location)\RESULTLOG-$(Get-date -Format "yyyyMMddTHHmmss").log"
Function Get-FileName{
[System.Reflection.Assembly]::LoadWithPartialName(“System.windows.forms”) | Out-Null
$OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
$OpenFileDialog.initialDirectory = Get-Location
$OpenFileDialog.filter = “All files (*.*)| *.*”
$OpenFileDialog.ShowDialog() | Out-Null
$OpenFileDialog.filename
}
$Importfile = Get-FileName
$Clients = Get-Content $Importfile
Foreach($Client in $Clients){
#CHECK IF PC IS ENABLED IN AD <<<<feature improvement
# if(get-adcomputer -Filter 'Name -like $p' -Properties Enabled)
if (Test-Connection -ComputerName $Client -Count 2 -Quiet) {
try {
Get-HotFix -ComputerName $Client -Description 'Security Update' | Select-Object -Last 1
}
catch {
"$Client;An error occurred."
}
}
else{
"$Client;not on line "
}
}
Stop-Transcript
I'm also trying to work on checking if PC is enabled in Active Directory before running the rest of the code, but I have that commented out for the mean time what I got works.
Can the performance in this be improved?? I know that network speed might have something to do but for the amount of data from each PC should not take this long

Answer 1

Take a look at the "-Parallel" switch of ForEach-Object:
https://devblogs.microsoft.com/powershell/powershell-foreach-object-parallel-feature/
You may need to change your code a bit in order to make it to work with the ForEach-Object call instead of the foreach block:
...
$Clients | ForEach-Object {
if (Test-Connection -ComputerName $_ -Count 2 -Quiet) {
try {
Get-HotFix -ComputerName $_ -Description 'Security Update' |
Select-Object -Last 1
}
catch {
"$_;An error occurred."
}
}
else {
"$_;not on line "
}
} -Parallel
...
EDIT: As mentioned by #doug-maurer in the comments as well as in the link I provided, this will only work on PowerShell v7-Preview-3 onwards.