I have the same problem with Immortal Fenyx Rising. (epic games)
Performance test with processor overclock to 4.7GHz:
FPS: 22 min 97 avg 144 max
It can vary. I got even 11 fps min one time.
I tested it without overclock and results was even worse.
PC Specs:
Windows 10
Motherboard GIGABYTE Z370P D3 (rev. 1.0)
Processor Intel Core i9-9900KF
RAM Ballistix BLS2K8G4D30AESBK 2x8Gb 3000mhz
SSD m2 ADATA XPG GAMMIX S5 1TB
Videocard XFX Speedster MERC319 Radeon RX 6800 XT
PSU Deepcool DQ M-V2L 850W
Monitor Asus TUF Gaming VG27AQ (2560x1440) 165Hz 1ms IPS AMD FreeSync
I tried every suggestion on the internet. Nothing works. The game randomly stutters from time to time and also guarantee to stutter in some certain places. Also it stutters every time I press C (crouch)
I also watched some youtube videos that mesured performance and they had about the same issue with fps drops / stutters
I think ubisoft did a pretty bad job on optimizing performance for pc. And the game was released 5 month ago