@ubi-smash Hi! Ticket created. https://support.ubisoft.com/en-GB/Cases/14569643: (https://support.ubisoft.com/en-GB/Cases/14569643) Thank you!

@ubi-smash Thanks for a quick reply.

My version of windows dont offer "advanced graphics settings", where I could uncheck Enable fullscreen optimizations globally.
But I went to game folder and for both exe files ACValhalla and ACValhalla_Plus checked "Disable fullscreen optimizations".

Unfortunately without any effects.

My current screen settings:

Bought new laptop Lenovo Legion 5 Pro 16ACH6H.
Played 5 hours without serious issues.
Reached England, started to have huge FPS drops (70 -> 15)
Was trying to find solution (verified files, reinstalled etc) nothing worked.
Updated nvidia drivers. No effect.
Found new bios for my laptop. Installed. FPS issues seems to be solved. BUT!!!

This white border of the screen bug started to appear. It only appears in actual game, not in any menus. Other games work without issue. Any idea?

I though that many months after release this game is already in some stable state.
Sadly, no. Just bought new laptop with 3060 and Ryzen 7 5800H. Played couple of hours without any issues, but then started too see an pattern (especially when reaching England).
Usually randomly when fast travelling average fps drops from 60+ to 15, making game practically unplayable. Sometimes restart help, sometimes load helps. Some mentioned travelling to norway and loading again helps, sadly for me that doesnt help most of the times. Sometimes even after exiting and launching game again, *bam* 15 fps average.
Verified integrity of the game.
Reinstalled.
Using Geforce experience optimal settings for the game.
So the only thing what can be done is wait for patches?