FPS drops in co-op (Far Cry 5)

Hi all. I went through the game several times in a single, everything is fine there, stable 40 fps without drawdowns. When I decided to play the game in co-op, the fps in the session dropped to 20, and going back into the single again grew to 40.

Tell me, those who know, please, I really want to go in co-op, the game is a bomb

:( i3-2100 3.10 Ghz 8 RAM Many thanks in advance