$urls = @(
    "www.google.de"
    "www.amazon.de"
    "www.github.com"
    "www.youtube.com"
    "www.gibtsnicht.com"
)

$start = Get-Date

$jobs = foreach( $url in $urls ){
    Start-Job -ScriptBlock {
        param($u)

        if(Test-Connection -ComputerName $u -Quiet){
            "$u is reachable"
        }else{
            "$u is not reachable"
        }
    } -ArgumentList $url
}

$jobs | Wait-Job | Receive-Job
$end = Get-Date
$duration = $end - $start


Write-Host "Laufzeit: $($duration.TotalSeconds)"