Benchmark mode ? (time it took to generate an image)

Hi everyone,

thank you so much for your app ! the gui is cool :)

Given the interest from this twitter thread[1], I think it would be nice to display the time it took to generate an image at the end of the process (either in the log windows or in the main one)

[1] https://twitter.com/hardmaru/status/1572510963034509313?s=20&t=zT5gVHcOp9R-JlQwuX5CHw

Best,
ps: I'd be very interested by an intel port that uses the metal back-end from tensor-flow