Success, at last - some pointers
I have 4 large Aperture libraries that needed updating, on two machines. Great update, with only one complaint: where the hell is the needed lens aberration correction? Strange omission.
I did this on a Quad Tower and a 2.8 Core 2 Duo laptop. Notes:
1- Disable screensaver. An absolute necessity on the laptop, the screensaver coming on would be all it needs to totally stop everything. The Quad simply slowed down some.
2- UNCHECK the box that offers to "Reprocess" your images. Even including this option is patently INSANE, unless you get your jollies walking on hot coals. It is absolutely not needed. Without this done, when you bring up an image, you will have all the tools from before, plus some. Plus, at the top of the Adjustments window, you will be given a large BUTTON for reprocessing that image, on the spot and instantly. Also can be done in batches, although I fail to see the purpose for the torture. Even if the option is there during the initial upgrade, having it checked by default is a cruel joke. If I were Jobs, I would be PISSED.
Checking the box will make the upgrade process take over 10 times as long, and hang repeatedly (if you insist on being a masochist, leave the hangs go, they will work themselves out. Go start a pot of tea and watch some TV). The one library I did this to on the laptop was 45 gigs and took over 6 hours.
3- Immediately turn off "faces" in the preferences. You can turn it on again when you go to bed. The app is useless while it is functioning. Personally, I see no reason for it.