Just recently purchased Aperture for my new 12-core Mac Pro and I found the app being so slow it´s impossible to get any work done. I have 64GB of RAM and Thunderbolt 2 SSD with reading/writing speeds of over 1300 MB/s. I´m running the latest Mavericks. All my other apps work great! I have only yet imported one project in my library about 30 iPhone 5 photos, not even RAW! I get severe 5 second stutters where my mouse stops working when it´s trying to do some one simple adjustment. Even when I´m just browsing my photos left and right the app stutters little bit. This app is just horrible and very amateurish and Apple should give my money back! I googled and found this: https://discussions.apple.com/thread/5590335?tstart=0 One guy had this to say: Am I experiencing the same problem here? And does anyone else here have this problem? Or is Aperture this slow just normally? Why isn´t Apple doing anything about this?