I just started experimenting with face landmark tracking, and am getting about 3 fps on an iPhone6, 4 fps on an iPad Air 2. Does anyone know whether this is about what is to be expected, or should I look for some optimization? I had expected it could do better with a video sequence with little movement.
I'll just add my experience from macOS 10.13.1, processing a 640x480 camera stream: MacMini7,1 @ 10fps, and MacPro6,1 @ 16fps
So I'm also wondering if I'm missing some special 'trick' to make it real time.