How long is the generation taking on say a 2021 MacBook M1 Pro?

55 seconds on a M1 Pro MacBook with 16GB RAM to generate a picture (with default settings, so 512x512, 25 steps).

On a M1 Ultra, it takes 12 seconds with 64GB RAM (same settings). While computing, the Mac Studio is pulling 100 watts of power.

> 55 seconds on a M1 Pro MacBook with 16GB RAM to generate a picture

I've been running webui [1] on M1 MacBook Air 16GB RAM: 512x512, 50 steps takes almost 300 seconds. I'm suspecting that it is running on CPU, because the script says "Max VRAM used for this generation: 0.00G" and Activity Monitor says that it's using lots of CPU % and no GPU % at all. When M1 users are running stable diffusion, does the Activity Monitor show the GPU usage correctly?

[1] https://github.com/lstein/stable-diffusion