PowerShell | Need some performance improvement - performance

Question

I have written a powershell script for archival of old log files or say some output file of web application which is in TBs but the script is taking very long time. I have done some improvement but not able to speed up more from here.
Code:
#region Archive Files using 7zip
[cmdletbinding()]
Param
(
[Parameter(Mandatory=$true, HelpMessage = "Path needs to be with trailing slash at the end of location." )]
[string]$SourceFilesPath
)
$7zip = "C:\Program Files\7-Zip\7z.exe"
$FilePath = ""
foreach ( $filename in $(Get-ChildItem $SourceFilesPath -Force -Recurse | where {$_.LastWriteTime -lt (get-date).AddDays(-1).ToShortDateString()}))
{
$FilePath = Get-ItemProperty $filename.FullName
$ZipFilePath = $filename.Directory.ToString() + "\ZippedFiles" + "\Archive_" + $filename.LastWriteTime.ToString("MMddyyyy") + ".7z"
$tempPath = ("-w"+"C:\Temp")
$OutputData = &$7zip a $tempPath -t7z $ZipFilePath $FilePath
$OutputData
if ($OutputData -contains "Everything is OK")
{
Remove-Item $FilePath -Force
Write-Output "File removed $FilePath"
}
Get-Item $ZipFilePath | ForEach-Object {$_.LastWriteTime = $filename.LastWriteTime}
}
#endregion

Answer 1

#region Archive Files using 7zip
[cmdletbinding()]
Param
(
[Parameter(Mandatory = $true, HelpMessage = 'Path needs to be with trailing slash at the end of location.' )]
[string]$SourceFilesPath
)
Import-Module ..\Invoke-Parallel.ps1 # Download from PSGallery
$7zip = 'C:\Program Files\7-Zip\7z.exe'
$fileToArchive = $(Get-ChildItem $SourceFilesPath -Force -Recurse | Where-Object -FilterScript {
$_.LastWriteTime -lt (Get-Date).AddDays(-1).ToShortDateString()
})
$counter = 0
$groupSize = 2000 # Will group items by 2,000 increments
$groups = $fileToArchive | Group-Object -Property {
[math]::Floor($counter++ / $groupSize)
}
$groups
# This will spawn multiple instances of 7zip - depending on how many groups of 2,000 files exist
$groups.Group | Invoke-Parallel -ScriptBlock {
$FilePath = $null
$fileName = $_
$FilePath = Get-ItemProperty -Path $fileName.FullName
$ZipFilePath = $fileName.Directory.ToString() + '\ZippedFiles' + '\Archive_' + $fileName.LastWriteTime.ToString('MMddyyyy') + '.7z'
$tempPath = ('-w'+'C:\Temp')
$OutputData = &$Using:7zip a $tempPath -t7z $ZipFilePath $FilePath
$OutputData
if ($OutputData -contains 'Everything is OK')
{
Remove-Item $FilePath -Force
Write-Output -InputObject "File removed $FilePath"
}
Get-Item $ZipFilePath | ForEach-Object -Process {
$_.LastWriteTime = $fileName.LastWriteTime
}
}