MacBook Pro OS X Yosemite delayed and pixelated login screen

Hi,
Since I updated to Yosemite, it takes munch longer to startup my 2011 MBP and the login screen is distorted.
First, a black screen appears from 30 to 60 seconds, then a pixelated login screen (shown below) appears.
I reinstalled the OS X and repaired the permissions in safe mode. Disabled animation and widgets.
Suggestions to fix this annoyance will be appreciated!

Hi,
Since I updated to Yosemite, it takes munch longer to startup my 2011 MBP and the login screen is distorted.
First, a black screen appears from 30 to 60 seconds, then a pixelated login screen (shown below) appears.
I reinstalled the OS X and repaired the permissions in safe mode. Disabled animation and widgets.
Suggestions to fix this annoyance will be appreciated!

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