After rebooting the system appears to do nothing for at least 5 seconds (log in and beachball before the dock appears on the screen). HDD is perfect condition (it passes smart tests and the apple hardware test) and OS install is only a few weeks old, what is happening?
2011 iMac (21.5" 16gb ram. 1TB HDD)
2011 iMac (21.5" 16gb ram. 1TB HDD)