[nathas]

Depends what fork you're running... Some seem to be using CPU-based generation, others use the MPS device backend correctly which is MUCH faster. I have another comment floating around about lstein's fork, but it takes some massaging to get it to run happily. https://github.com/lstein/stable-diffusion/

[jw1224]

The fork linked by OP is MPS-based, I can see GPU usage way up in Activity Monitor. Seems performance doubled after a reboot though :)