iMac 2019 slow after Sequoia 15.3.1 update
After update from Sequoia 15.3 to 15.3.1 my iMac (2109, 1) became slow to start:
~20 sec (remains the same) until password dialog box, and
from <5 to ~25 sec until UI is stable (top bar visible)
The login screen shows the password dialog box in the centre middle (as in older OS versions), not in the bottom middle of the screen (as in Sonoma, Sequoia). During safe boot, the password dialog box is at the bottom, as expected. After log off/ log on the same (also at bottom).
BT keyboard and mouse are initially not working during PW entry, but can be woken up by pressing a key (multiple times) and clicking a mouse button. Both are fully responsive after completed start-up.
After start up, computer appears to work normally, but according to EtreCheck it runs slow and there are numerous app crashes.
Several third-party software installed. As far as I can tell, everything is compatible with Sequoia.
Note: Same issue after originally upgrading from Sonoma to Sequoia (15.2). After formatting disk and trying to migrate from from time machine backup, same issue. When migrating only data (which includes the ~/Library folder) from time machine, same issue! Apparently my old profile was corrupt.
Note 2:
After reformatting and installing Sequoia 15.3 and manually re-installing all software (not using time machine), the iMac worked perfectly (until this update to 15.3.1). I worry that the update to 15.3.1 corrupted it again. How do I identify the culprit?
Note 3:
My wife has an identical iMac which updated without problem to Sequoia 15 and now to 15.3.1
How do I attach the EtreCheck report? Below are already some screenshots.
iMac 27″, macOS 15.3