I am also having the exact same performance issue with each update.It feels like the game becomes more and more unplayable with every update. On purpose i didn't touch the game for half a year. Coming back and it is still unplayable.
My rig can handle basically everything at maxed out graphics be it AC Valhalla or DOOM, Watchdogs Legion etc.
So can someone explain to me how after half a year the same peformance issues are still present and the game is still near unplayable for ppl like me?
Moreover, the graphics feel like they've become worse, especially on the world map.
I remember someone saying that reinstall fixes the issues. Maybe I will try reinstalling the game as well.