That should be the end of the story but it's not because bafflingly, the 60fps performance mode is now noticeably slower on PlayStation 5 and Xbox Series X
Series X:
Starting off with Series X as an example, our Novigrad test run shows a drop by as much as eight or nine frames per second on the new patch. For the entire route, by foot or horseback, the drop-off is impossible to ignore now. Frustratingly, in many areas where 60fps was possible at launch on Series X, it's now closer to the 50fps line.
PS5:
The problem remains areas outside the city: where our representative battle with the bandits now runs at a significantly lower frame-rate - by as much as 10fps. Even simple horseback routes in the countryside take a hit to the mid-50s, where before PS5 was a locked 60fps. Patch 4.01 genuinely downgrades the frame-rate, and we lose ground - even in cutscenes. So yes, if you've noticed your frame-rate dropping since the patch, you're not mistaken.