Powershell Remoting Speeding up a Foreach Loop Hosted Exchange - powershell

Question

I have a CSV of email adddresses and Departments that I need to set on Live#edu. The command I currently have looks something like this:
Import-CSV departments.csv | ForEach-Object { Set-User $_.EmailAddress $_.Department }`
The problem is, this operation takes FOREVER.
My first thought is that it would be great to have the ForEach-Object command actually be forwarded over to the remote machine, so that it will only need to create the one pipeline between the two machines, but when I go into the PSSession, there doesn't seem to be any foreach-object available. For reference, How I Import the PSSession is:
Import-PSSession(New-PSSession -ConfigurationName Microsoft.Exchange `
-ConnectionUri 'https://ps.outlook.com/powershell' `
-Credential (Get-Credential) `
-Authentication Basic -AllowRedirection)
Is there a better way that I can import the session to allow ForEach-Object to be remote, or to import an aliased version of the remote foreach-object, perhaps as ForEach-Object-Remote, or perhaps does anybody have something better to suggest to streamline this process?
UPDATE:
A Couple Things I've tried:
Using the -AsJob switch on the implicitly remoted command.
Import-CSV departments.csv | ForEach-Object { Set-User $_.EmailAddress $_.Department -AsJob }
This, unfortunately, doesn't work because there are throttling limits in place that don't allow the additional connections. Worse than that, I don't even know that anything went wrong until I check the results, and find that very few of them actually got changed.
Importing the ForEach-Object under a different name.
Turns out that adding a prefix is easy as putting -Prefix RS in the Import-PSSession Command to have things like the ForEach-Object from the Remote Session become ForEach-RSObject in the local session. Unfortunately, this won't work for me, because the server I'm connecting to does not does not have the Microsoft.Powershell ConfigurationName available to me.
UPDATE 2: The Set-User cmdlet seems to be Microsoft provided for Live#edu administration. Its purpose is to set User attributes. It is not a script or cmdlet that I am able to debug. It doesn't take pipeline input, unfortunately, so that would not be able to fix the issue.
As Far as I can tell, the problem is that it has to construct and tear down a pipeline to the remote machine every time this command runs, rather than being able to reuse it. The remote ForEach idea would have allowed me to offload that loop to avoid having to create all those remote pipelines, while the -asJob would have allowed them to all run in parallel. However, it also caused errors to fail silently, and only a few of the records actually get properly updated.
I suspect at this point that I will not be able to speed up this command, but will have to do whatever I can to limit the amount of data that needs to be changed in a particular run by keeping better track of what I have done before (keeping differential snapshots). Makes the job a bit harder.
EDIT: Start-Automate left a very useful help, unfortunately, neither of them work. It is my feeling at this point that I won't find a way to speed this up until my provider gives access to more powershell cmdlets, or the exchange cmdlets are modified to allow multiple pipelines, neither of which I expect to happen any time soon. I am marking his answer as correct, despite the ultimate result that nothing helps significantly. Thanks, Start-Automate.

Answer 1

You can speed up your script and also avoid trying to make two connections to the server by the use of the foreach statement, instead of Foreach-Object.
$departments = #(import-csv .\departments.csv)
foreach ($user in $departments) {
Set-User $user.EmailAddress $user.Department
}
If you need to batch, you could use the for statement, moving forward in each batch
for ($i =0; $i -lt $departments.Count; $i+=3) {
$jobs = #()
$jobs+= Invoke-Command { Set-User $departments[$i].EmailAddress $departments[$i].Department } -AsJob
$jobs+= Invoke-Command { Set-User $departments[$i + 1].EmailAddress $departments[$i + 1].Department } -AsJob
$jobs+= Invoke-Command { Set-User $departments[$i + 2].EmailAddress $departments[$i + 2].Department } -AsJob
$jobs | Wait-job | Receive-job
}
Hope this helps