Hey, is anyone encountering slow shutdown speeds on their retina display MBP? I just recently purchased mine and I seem to have a 20 second duration till shutdown, as soon as the grey background appears. I'm kind of worried that my machine is defective and was hoping anyone else could share their experiences. Although it may be possibly because of the software I installed (About 70GB worth) that caused this excessive slow down. Hopefully I'm not alone and this is an issue with Lion because my 2011 iMac does the same for shutdown speeds, just a few more seconds longer (About 2-5).