Can confirm my performance is also terrible. CPU jumps to 100% every 5 minutes and causes a full game freeze for up to 10 seconds. Did not happen prior to this patch.
I also have a Intel(R) Core(TM) i5-6600K CPU @ 3.50GHz 3.50 GHz
My pc however has an RTX 3060, wih 32 GB of DDR4 2133 and 2 ssds running in raid 0 over sata.
Yep, i am experiencing that too--I didn't run task manager to check CPU useage, but it definitely was getting up there because I had the solid 10 second freezes too, especially right before cutscenes or right before combat starts.
AND you have more memory than I do with 2 SSDs instead of 2 SDHDs, so I think yours lends more credibility to this being a game issue--although the fact that I didn't have it happen prior to this patch should still prove that imo.