Huh, the PS5 version in Performance Mode is using FSR 3 frame generation out-of-spec, i.e. to try to reach and maintain 60fps rather than to scale above it as AMD recommends. Lots of interesting material to chew on here.
(Alex has also indicated that DF will offer a PC settings optimization guide for the game in due course.)
EDIT: That's an impressive collection of technical quirks. That isn't even meant as criticism: it's a genuinely interesting technical case study, in the vein of
Cyberpunk 2077 at launch.