openface/docs/performance.md

How long does processing a face take?

The processing time depends on the size of your image for face detection and alignment. These only run on the CPU and take from 100-200ms to over a second. The neural network uses a fixed-size input and has a more consistent runtime. Averaging over 500 forward passes of random input, the latency is 77.47 ms ± 50.69 ms on our 3.70 GHz CPU and 21.13 ms ± 6.15 ms on our Tesla K40 GPU, obtained with util/profile-network.lua