Boost iMac boot time
I bought myself one of those cool and fancy iMac 27″ machines last year in November and only today I found out why it was rather slow to boot up to the login screen.
It seems that by default the iMac is trying to boot from the network and will only boot from the local disk once the boot from network times out.
If you want to change this behaviour, you need to select your local hard disk as startup disk in ‘System Preferences/Startup Disk’.
After making this change on my iMac, the boot time went from around 50 seconds to 30 seconds!
If only I had known this a couple of months earlier …

Unbelievable, you just saved myself also almost half the boot time!
Thanks!