[Huge fps drops and game crashes]

bns is only game that is doing this, for example ark with is way more heavy on pc i can run on ultra with 120fps+ 

[Huge fps drops and game crashes]

i have capped fps on 60, but even in dungeons like brood chamber i get sometoimes down to 15fps with everyone hidden
i have looked in registry but there is no fault layer from bns

[Huge fps drops and game crashes]

my game runs 30 - 15fps with CPU on 10 - 15% and mem 50-60% (half are web tabs) ................ game stopped responding 4x in dungeon, unplayable
GeForce GTX 1080 Ti
I7-8700K 3.70GHz
16GB RAM
any solutions ?

EDIT: game is on SSD