Hello,
Tested Blender 3.1 with macOs 12.3 on my MBP ( i7 - 15’ - 2016 - Radeon pro 460 - 16go ) and Blender 2.93 with my PC (i7 - 16go - Radeon VII) with BMW gpu (Cycle default 1225 samples).
Mac: 4’40s
Pc : 1’05s
But I notice that with 300 samples on Mac, il’s visually (almost) the same result for the same time…
I will test on Mac with a eGpu and my Radeon VII.