I have a Retina MacBook Pro that I bought new in October of 2012. Since the day I got it, it's taken 12-15 seconds to boot up every single time, consistently every time. Over the past three days, it's been taking double that time, between 30-45 seconds for the computer to load past the boot screen and into the login screen. I've tried performing First Aid on the SSD through Disk Utility but that didn't seem to help any. I find it very odd that it started taking double the time to load out of the blue, especially when it's never done this before. Any suggestions as to what may be causing this? Besides its age?