Settings? I assume it's a driver bug but if I enable HBAO+ Ultra or what it was called the framerate drops down to single-digit no matter what other settings I use or which resolution I use so maybe that's the same error you've encountered? (With normal HBAO+ and everything else maxed the game runs at around 40 - 50 FPS most of the time though cutscenes are a bit lower if you are downsampling from 3K or higher or what to call it.)

Fixed changing of display in fullscreen mode issues

Nah is still broken like it was before. Still many ppl have this problem. Funny is many people report this in beta, preview, also on "gold state" version. UbiLol never gonna learn it, it's time for them to change that problematic Anvil Engine with evry version there is new list of problems. True is that this is the same Anvil Engine like in 1st AC just assets are replaced with ACS even downgraded, just like in CoD they are doing ;] Shame big shame, performace also lame compared to what we have on screen, and how good SW:BF/Witcher3 look or AC:Unity 😉