PowerShell using start job to run multiple code blocks at the same time

Question

I will be working with many 1000’s of names in a list preforming multiple function on each name for test labs.
I notice when it is running the functions on each name I am using almost no CPU or memory.  That led me to research can I run multiple threads at once in a PowerShell program. That lead me to articles suggesting start-job would do just want I am looking
for. 
As a test I put this together.  It is a simple action as an exercise to see if this is indeed the best approach.  However it appears to me as if it is still only running the actions on one name at a time.
Is there a way to run multiple blocks of code at once?
Thanks
Start-Job {
$csv1 = (Import-Csv "C:\Copy AD to test Lab\data\Usergroups1.csv").username
foreach ($name1 in $csv1) { Write-Output "Job1 $name1"}
Start-Job {
$csv2 = (Import-Csv "C:\Copy AD to test Lab\data\Usergroups2.csv").username
foreach ($name2 in $csv2) { Write-Output " Job2 $name2"}
Get-Job | Receive-Job
Lishron

Answer 1

You say your testing shows that you are using very little cpu or memory in processing each name, which suggests that processing a single name is a relatively trivial task.  
You need to understand that using a background job is going to spin up another instance of powershell, and if you're going to do that per name what used to require a relatively insignificant amount of memory is going to take around 60 MB.  
Background jobs are not really well suited for multi-threading short-running, trivial tasks.  The overhead of setting up and tearing down the job session can be more than the task itself.
Background jobs are good for long-running tasks.  For multi-threading short, trivial tasks runspaces or a workflow would probably be a better choice.
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