hello, I have instaled AC Valhalla on my pc and from a start, it started showing an fps jump and down. I attached benchmark results, I try everything I could find on YT and websites. After 4h of updating and customising settings etc. fps increased about 50% but still jumps up and down... what makes the game unplayable... It's the first time I'm playing a game and had an issue like that. Can you recommend what to do to fix it?