When I open iPhoto it seemingly automatically scans to detect missing faces (the circle starts spinning next to Faces) - consequently iPhoto and other apps on my Mac work slower.
How do I turn this off?
I still want to occasionally scan for missing faces but manually.
You can't. Send a feature request to Apple via http://www.apple.com/feedback/iphoto.html .
Thanks...as I have over 15,000 photos this is quite frustrating.
Let it go thru it's first scanning and after that scans of small imports are not disruptive.
Retrieving data ...