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face detection is slow, and it gets worse with larger images, but you can try to:

• use a lbp cascade instead of a haar one (they're much faster!)
• optimize detectMultiScale params ,like:
  • increase the scale factor (less iterations)
  • set a proper maxSize() (again, less iterations)
• drop frames, now and then. (maybe you do not need to detect a face in each frame)