added Multithread variant for PS 5.x

Parallel-ps5.ps1

@@ -0,0 +1,28 @@
+$urls = @(
+    "www.google.de"
+    "www.amazon.de"
+    "www.github.com"
+    "www.youtube.com"
+    "www.gibtsnicht.com"
+)
+
+$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)"

Parallel.ps1

@@ -0,0 +1,34 @@
+$urls = @(
+    "www.google.de"
+    "www.amazon.de"
+    "www.github.com"
+    "www.youtube.com"
+    "www.gibtsnicht.com"
+)
+
+$start = Get-Date
+
+$urls | ForEach-Object -Parallel {
+    $reachable = Test-Connection -ComputerName $_ -Quiet
+    if($reachable){
+        Write-Host "$($_) is reachable"
+    }else {
+        Write-Host "$($_) could not be reached"
+    }
+}
+<#
+$urls | ForEach-Object {
+    $reachable = Test-Connection -ComputerName $_ -Quiet
+    if($reachable){
+        Write-Host "$($_) is reachable"
+    }else {
+        Write-Host "$($_) could not be reached"
+    }
+}
+#>
+
+$end = Get-Date
+$duration = $end - $start
+
+
+Write-Host "Laufzeit: $($duration.TotalSeconds)"