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The issue is that PowerShell expects null value to be specified as $null,
In your case, this is the correct syntax:
if($_["Task Owner"] -eq $null)
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According to the article: Increasing this limit increases the throughput of starting and completing workflow tasks but also increases load against the content database and system resources.
So I think there is no upper limit for the parameter -WorkflowPostponeThreshold.
Besides, the three parameters to improve the workflow Performance.
1.Increase Throttle ...
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