Question: I don't like the feature that automatically detects faces in Photos for OS X because of the unnecessary CPU and disk space consumption. A photo library of 360 MB generated 50 MB of face detection data inside the Photos Library.

Is there any way to disable this feature in Photos for OS X?

Answer: 
Apparently you can stop face recognition by quitting iPhotos, opening a terminal and typing the following (and press enter):

```
defaults write com.apple.iPhoto PKFaceDetectionEnabled 0

```

I guess you'll then need to manually delete all the faces it's recognised thus far.

As for the new "Photos" app, I don't think you can disable the face detection.
You can find the option in **View > Hide Face Names**.