I have a Community 3.2 installation running on a test server with the AD membership and role provider in place.
During a stress test I experience some deadlocks on user creation (SecurityHandler.AddUser)
Any ideas on how to handle/prevent this?
I'd consider upgrading to SP1 if you have not already done so. Some changes have been made to optimize user creation, I believe there was some locking hints to related sprocs in SQL Server.