As one of the devs mentioned earlier in the thread, they kinda knew it wasn't ever going to be the most graphically demanding game, so they put in all these smoke, fire, and explosion transparent effects which absolutely destroy the performance because they could on the PS4 and PC (which it was initially made for). Look at any Nintendo game and you'll see an almost complete lack of transparent (or alpha) effects which helps performance greatly. It would be great to simply turn off these effects, but they're kinda a big part of the unlockables/loot system of the game (you can get different explosions and such) so removing them would ruin feature parity between the platforms, which is a big issue when you're doing crossplay.