Issues on Solaris 10 with logins and other functions that are very slow and the system can appear hung due to the time taken.
Only Solaris 10 is impacted by this specific issue.
This is a known issue with Solaris 10 that is documented in their knowledge base under Doc ID 2228462.1
It details the following systems and patch levels are affected when using ZFS and there are more than 40 CPU's.
Solaris 10 with patch 150400-44, 150400-45, 150400-46, 150400-47
Solaris 10 with patch 150401-44, 150401-45, 150401-46, 150401-47
The current state of the Oracle article indicates the final solution is pending and workarounds are to roll back to a previous Boot Environment.
One Identity support recommends contacting Oracle support for additional information.