For some time (not sure if this is since Mavericks, or before) Aperture has been a PITA to use. Opening it takes around 30-40 seconds. Editing images is slow, very slow. Changing projects takes also a lot of time. And don't even try to close the app, since it takes around 4-5 minutes to close, because each time it shows "Library Updating". I have my photos in an external drive, the library files and previews are on my Mac. I have around 25,000 photos. I have a Macbook Pro Late 2011 15", 8GB of RAM. Running Mavericks and all updates installed. I know this is not normal, but does anyone here has suffered from this and found a solution?