2013 – PowerShell Script for SharePoint Add Item & Update Item gets stuck at $item.Update()

I have ran into kind of strange issue today with my SharePoint 2013 Farm. I have one PowerShell Script(Runs in App Server) to Add Items to a List. Suddenly, this Script is taking very long time to go to next line after it calls $item.Update().

But the same time If I run the same script on my Front End Server. It works as expected without any Delay.

Could somebody give a hint or suggestion what is going on here?

Note: I have created Test List and used PowerShell to add new item from the server(App Server) where I have the issue, It worked fine.