I have a problem when I try to purge workflow data from Central Administration -> Nintex Workflows Management -> Purge Workflow Data, It takes more than 10 minutes and I get "The wait operation timed out"
it is quite slow
deletes 2000 records in 20 minutes
Have you tried using the NWAdmin tool and issuing the purge command that you can find in here: NWAdmin Operations - Nintex Workflow 2013
Or you can use Powershell like in this example: How to purge items from a large history list safely via PowerShell
Retrieving data ...