Is there other purging requests should be run frequently to enhance the application performance
Usually we run "Purge Obsolete Workflow Runtime Data" & "Purge Concurrent Request and/or Manager Data" .
But what other important purging requests.?
Yes, please see the following docs for the list of programs you need to schedule.
What Are Concurrent Reports That Should Be Scheduled Periodically (Doc ID 1066117.1)
Reducing Your Oracle E-Business Suite Data Footprint using Archiving, Purging, and Information Lifecycle Management (Doc ID 752322.1)
Purging Strategy for eBusiness Suite 11i (Doc ID 732713.1)