Any tips on improving CPU performance?

I tried asking this question on the discord but didn't get any useful replies. I'm currently struggling to maintain 60 FPS in Demon's Souls (range of 45-60, average around 55), and the issue is entirely CPU related, as FPS is identical at 4k and 720p. My CPU is a i7-6700K. I have applied the option of limiting Maximum SPURS threads to 3. Is there anything more i can do to improve CPU performance?

This might help > https://www.pcgamer.com/uk/overclocking-...-i7-6700k/

Apply this configs and maybe better run (might establish 60 frames) ,and if have a update download for have best performance possible
Here the link of config:
https://drive.google.com/folderview?id=1...QeJC6xsnt4