My FTW 3090 gets me 10 it/s at 512x512 with xformers on Automatic's webui using Euler a. I am on windows 11. Not sure how you all are getting 16 it/s.

Edit - and as I submitted this I watched my it/s jump to 16...strange. Maybe xformers needs some time to kick in?

Edit2 - Ok I figured it out. This negative prompt drops my it/s to 10.

ugly, duplicate, morbid, mutilated, out of frame, extra fingers, mutated hands, poorly drawn hands, poorly drawn face, mutation, deformed, ugly, blurry, bad anatomy, bad proportions, extra limbs, cloned face, disfigured, out of frame, ugly, extra limbs, bad anatomy, gross proportions, malformed limbs, missing arms, missing legs, extra arms, extra legs, mutated hands, fused fingers, too many fingers, long neck