SharePoint 2016 Standard Edition
When I try to upload an document to the document library, it shows "This shouldn't take long" for longtime. Approximately it takes 5 mins to show metadata forms.
Check-in also issue, it shows the following error message after loading longtime, "The server was unable to save the form at this time. Please try again."
Note: Server CPU Utilization and Memory looks fine. I checked in Chrome and IE. All libraries working fine in the same Site Collection other than this. The difference between this library(errored) and other library is, I created overlay in the calendar for this library.