https://www.reddit.com/r/sysadmin/comments/au94n3/your_top_5_powershell_commands_which_save_you_the/eh783ck/

TestWhereMethod.ps1

$arrayList = New-Object -TypeName System.Collections.Generic.List[int]
0..9999 | ForEach-Object { $arrayList.Add($PSItem) }

$iterations = 1000

$results = New-Object -TypeName System.Collections.Generic.List[PSCustomObject]
1..$iterations | ForEach-Object {
    $number = Get-Random -Maximum 9999
    $resultObject = [PSCustomObject]@{
        whereMethod = (Measure-Command -Expression { $arrayList.where{$PSItem -eq $number} }).Milliseconds
        whereObject = (Measure-Command -Expression { $arrayList | Where-Object { $PSItem -eq $number } }).Milliseconds
    }
    $results.Add($resultObject)
}

[PSCustomObject]@{
    Iterations = $results.count
    whereMethod = [math]::Round(($results | Measure-Object -Property whereMethod -Average).Average,2)
    whereObject = [math]::Round(($results | Measure-Object -Property whereObject -Average).Average,2)
}