Huh... The title of their press release seems to me somewhat clickbait-y... Why not 'iMac got a hardware refresh; now with 2x performance'? When I read this, I thought, 'oh wow, Apple really outdid itself with their SW optimisations'. Overall, I'm kinda disappointed that the 21' and 27' macs get different CPU gens. Why? Why not just have the latest gen in both of them? Is it price, or is it more about artificial perf…
To me it is obvious it's about HW. These are new iMac release notes, not new macOS announcement.