Restart multiple Azure VMs

Hello,

I am trying to restart multiple VMs in parallel. But for some reason the code doesn't work. I can see proper messages from the Write-Host (proper name and serviceName) but the restart is not done.

$vms = Get-AzureVM | Where { $_.Name -like "TEST*" } | %{
    $vm = $_   
    $ScriptBlock = {
        $vmName = ($using:vm).Name
        $serviceName = ($using:vm).ServiceName
        Write-Host "Name='$vmName', ServiceName='$serviceName'"
        Restart-AzureVM -Name $vmName -ServiceName $serviceName
    }
    Start-Job $ScriptBlock
}
while (Get-Job -State Running)
{
    Start-Sleep 1
}
Get-Job | Receive-Job

When I update the code to:

$vms = Get-AzureVM | Where { $_.Name -like "TEST*" } | Foreach { Restart-AzureVM -ServiceName $_.ServiceName -Name $_.Name }

VMs are restarted, however in sequence, one by one. Anyone who can give me some advice what is wrong? Thank you.