Face detection freezes my system

Has any of you experienced hanging/freezing problems while face detection is running? I tagged a couple of faces from my pictures (my library size is about 70gb) and shortly after this my whole system hangs. Mouse still moves, but I cannot click anything and I can't even bring up force quit even using keyboard shortcut!

Yes. Although it doesn't crash iPhoto for me, it brings my system to a crawl while it looks for faces in photographs of trees, buildings, clouds etc. I don't take many pictures of people, and I just don't want it to try to identify anyone. I haven't defined any faces, so why is it looking? So it can identify that complete stranger that accidently walked into my photo of Angkor Wat?
I really really want a way just to switch this off. Please. Howsabout if you haven't defined any faces it doesn't look for any? I mean, if you haven't already defined a face, why is it looking at all?!
Please make it stop.

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    SubSection "Display"
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    Depth 4
    Modes "1024x768" "800x600"
    EndSubSection
    SubSection "Display"
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    Depth 8
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    EndSubSection
    SubSection "Display"
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    Depth 15
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    EndSubSection
    SubSection "Display"
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    Depth 16
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    EndSubSection
    SubSection "Display"
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    Depth 24
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    EndSection
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