Slow boot? Try this. If still slow, check your startupitems and launch daemon and launch agent folders for what is loading:
Clear the dynamic loader shared cache by booting one time is Safe mode.
Rebuild Kernel Extension Caches with a few terminal commands
The whole process will take you approximately 4 to 5 minutes to perform and you might just feel like your system is new again!
Step 1 : Clear the dynamic loader shared cache
So First: boot in safe mode by restarting your mac by holding the SHIFT key immediately after hearing the boot chime. When you reach the login window, dont even log in, just hit restart.
Step 2 : Rebuild Kernel Extension Caches
Open a terminal window and type the following commands:
sudo chown root:admin /
(the system will ask your password to grant access to the sudo chown command as this requires admin privileges)
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
Thats all there is to it!