How can I speed up a PowerShelll foreach loop - powershell

Question

I have a PowerShell script that connects to a database and pulls a list of user data. I take this data and create a foreach loop to run a script for the data.
This is working but its slow as the results could be 1000+ entries, and it has to complete the Script.bat for User A before it can start User B. The Script.bat for a single user is independent from another and takes ~30s for each user.
Is there a way to speed this up at all? I've been playing with -Parallel, ForEach-Object and workflow but I can't get it to work, likely due to me being a noob in PS.
foreach ($row in $Dataset.tables[0].rows)
{
$UserID=$row.value
$DeviceID=$row.value1
$EmailAddress=$row.email_address
cmd.exe /c "`"$PSScriptRoot`"\bin\Script.bat -c `" -Switch $UserID`" >> `"$PSScriptRoot`"\${FileName3}_REST_${DateTime}.txt 2> nul";
}

Answer 1

You said it yourself, your bottleneck is with the batch file in your script, not the loop itself. foreach (as opposed to ForEach-Object) is already the faster foreach loop mechanism in PowerShell. Investigate your batch file to find out why it takes 30 seconds to complete, and optimize it where you can.
Using Jobs
Note: Start-Job will run the job under another process. If you have PowerShell Core you can make use of the Start-ThreadJob cmdlet in lieu of Start-Job. This will start your job as part of another thread of the same process instead of starting another process.
If you can't optimize your batch script or optimize it to meet your needs, then you can consider using Start-Job to kick off the job to execute asynchronously, and then check the result and get any output from it using Receive-Job. For example:
# Master list of jobs you need to check the result of later
$jobs = New-Object System.Collections.Generic.List[System.Management.Automation.Job]
# Run your script for each row
foreach ($row in $Dataset.tables[0].rows)
{
$UserID=$row.value
$DeviceID=$row.value1
$EmailAddress=$row.email_address
# Use Start-Job here to kick off the script and store the job information
# for later retrieval.
# The $using: scope modifier allows you to make use of variables that were
# defined in the session calling Start-Job
$job = Start-Job -ScriptBlock { cmd.exe /c "`"${using:PSScriptRoot}`"\bin\Script.bat -c `" -Switch ${using:UserID}`" >> `"${using:PSScriptRoot}`"\${using:FileName3}_REST_${DateTime}.txt 2> nul"; }
# Add the execution to the $jobs list to check the result of later
# Casting to void here prevents the Add method from returning the object
# we've added.
[void]$jobs.Add($job)
}
# Wait for the jobs to be done
Write-Host 'Waiting for all jobs to complete...'
while( $jobs | Where-Object { $_.State -eq 'Running' } ){
Start-Sleep -s 10
}
# Retrieve the output of the jobs
foreach( $j in $jobs ) {
Receive-Job $j
}
Note: Since you have ~1000 times you need to execute this script, you may want to consider writing your logic to only run a certain number of jobs at a time. My example above starts all necessary jobs without regarding the number that may execute at once.
For more information about jobs and the properties you can inspect on a running/completed job, check the links below:
About Jobs
Job Class
Using Scope*
* The documentation states that the using scope can only be declared when working with remote sessions, but this seems to work fine with Start-Job even if the job is local.