Just turned it on on my 15" 2012 rMBP and it finished encrypting the drive. Before I was getting around 520-540MB/s read/write. Now it's 440-460MB/s. It's not a

Just turned it on on my 15" 2012 rMBP and it finished encrypting the drive. Before I was getting around 520-540MB/s read/write. Now it's 440-460MB/s. It's not a large hit, slightly noticeable, but worth the security. I am not sure about battery life, but I could not see any one else online complaining.