Hacker and modder Lance McDonald pointed this out on Twitter. He said that the PS4 version when played on a PS5 plays at a locked 60 frames per second and is “much smoother than the native PS5 build.” ...
Red Dead Redemption made its debut on PS4 and Nintendo Switch back in August with a sorely disappointing framerate of 60 frames per second. Even on PS5 the game would run at this lower framerate ...