I've not sure what the "performance issues" you're dealing with, but since Beyond Light hit, I generally have 35-50 FPS less than I should, in pretty much all areas. All game settings are maxed.
Resolution 3440x1440
FOV-Maxed.
Motion Blur is off, everything else is maxed.
Maximus Hero X
I7-8700K(OC-5.0)
Asus Cerberus 1070-TI(OC-1901)
G.Skill 3200mhz 16GB
Corsair H100I Platnum RGB
Corsair RM750X
I used to get 95-110 FPS straight down the board, now I'm getting 45-70