Hi Trode-_-! I appreciate you posting your PC specs here. It looks like your CPU might be slightly lower than what's required to play Assassin's Creed Valhalla on a low preset. For a full list of what's recommended, please check out this article.
Hello there Lockmort,
Sorry for the delay in getting back to you!
Cross-Progression is only available between platforms in the same family, for example; You will be able to move from PlayStaion 4 to PlayStation 5 however cannot move from PlayStation 4 to PC or Xbox or vice versa.
You can read this in more detail here.
Sorry for any inconvenience!