Hi, I've got a small but annoying issue with my late 2013 15" base rMBP. When it boots, the desktop shows up in a laggy way, not fluid. Everything else works fine, Safari, iPhoto, iMovie, Pages... I'm using it in the recommended resolution, the wallpaper is 2880 x 1800, and the only app that opens automatically is Dropbox. I've been using a late 2012 for a while and it doesn't do that. The desktop shows up smoothly when booted. Any ideas will be highly appreciated. Thanks in advance.