After updating to Mavericks, iTunes 11.1.3, and Aperture 3.5, I am finding my iPhone/iPad syncs incredible slow. Especially the "Importing photos" step takes forever. I have my photos on my NAS, organised in Aperture, and have always synced from there in iTunes. Aperture, and a few of my albums are selected, and the correct photos go onto the iPhones/iPads. So it works, but it can easily take 15 minutes, even when I haven't added any photos, and even if I have, the copying across only happens in a later step. My photos are organised in Aperture with reference, but Aperture is not any faster/slower than it has ever been. I can hear on the NAS (ticking/searching sound) that it is spending the time looking for something, but I have no clue what???