Yosemite 10.3.3 update Slow
After 10.3.3 update, my Macbook Air is slow to boot up, taking 40-50 seconds instead of the previous 8.
MacBook Air (13-inch, Early 2014), OS X Yosemite (10.10.3), null
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Select Macintosh HD as the Startup Disk.
“Set the default startup disk” http://support.apple.com/kb/HT1310
Reset PRAM. http://support.apple.com/kb/PH18761?viewlocale=en_US&locale=en_US