OSX 10.10.2 Yosemite Slow Reboot Problem
Millions of mac units have been upgraded to OS X 10.10.2 Yosemite and rebooting process takes 42 seconds on average instead 20 + . The reason is still unknown
but more likely new OS X all fix the problem . It also appears that SSD macs didn't suffer from this issue so it is mainly affecting on regular hard drive base mac units.
you can do better apple ... we are waiting for new OSX...