While Patch 1.2 made the game playable, it did fix the broader performance issues like "NPC pop-in" or the massive frame rate drops in crowded areas . To get the best experience, you should ensure your game is updated to the final version, v1.5.0 , which includes the "Dead Kings" DLC for free and offers the most stable performance . Assassin's Creed Unity Patches and Updates - SteamDB
The launch was so problematic that Ubisoft halted sales of the Season Pass and offered free games to affected players. It was a PR nightmare, but the developers went back to the drawing board. assassin39s creed unity patch 12 pc download better