The cause is probably related to the new OS, but I don't have that same wait on my multiple Tahoe systems, so it's not just because: Tahoe.
If you're a Linux user, or were a Linux user, check the logs, close programs, uncheck login items 1 by 1, run "launchctl list", etc to identify the specific cause.
If you're a Linux user, or were a Linux user, check the logs, close programs, uncheck login items 1 by 1, run "launchctl list", etc to identify the specific cause.