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?