We have around a dozen service desks running on our Jira Data Centre instance (Version 4.1.0 SD 8.1.0 JIRA). While most service desks create tickets, do assignments, add comments in around 2 secs, we have one (1) service desk that takes between 10 and 20 secs to complete the same kind of tasks.
Several of the Service Desks have thousands of customers. All create issues from email or portal.
Any help on what to check, any tips, tricks, anything you have/know is greatly appreciated