Yosemite delays in boot

[cool11]

I hoped that an update could fix this, but it did not, at least yesterday's update.
My mbp, late 2013 15', booted in 15 seconds when I had Mavericks.
Now in Yosemite it takes about a whole minute to get into osx!

Is it a Yosemite problem?
I can't imagine that there could be something wrong in my system, because just a month ago Mavericks booted almost instantly.

Anybody else facing the same problem?
Can I search for something that could solve the problem?

 

[simonsi]

Sensible conclusion is that likely one of your login items/apps isn't playing nice with Yosemite and needs updating or removing until updated.

To check, boot in Safe Mode. If all is well remove all your login items and add them one at a time until you find which is causing the problem.

 

[xgman]

First open up system prefs and make sure the "startup disk" is still selected.

Then:

This article proposes two actions:

Clear the dynamic loader shared cache by booting one time is Safe mode.
Rebuild Kernel Extension Caches with a few terminal commands


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, don’t 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