It seems that to get the fps back to where you had it in ch1/2, you need to tour your entire maps area and remove ALL basic karakuri litter. And probably vines too to be safe
this started fine but got worse with time
by the time we were late game ch4 it was 20 fps outa battle. Throw rain in and the screen looked 540p
the rain automatically comes late ch4 everywhere and never stops til ch5
After deleting every single piece of karakuri in a map, then finishing ch 4 so the rain freaking stopped, FPS finally is normal again just like in ch1/2. This is also probably why theres heated debates about the topic. Good vs horrible. Players that build next to nothing and dont leave litter karakuri on the map will never have this issue (on ps5)
problem with this is karakuri all over is supposed to be a feature. In this case it actually wrecks fps completely on ps5. So does rain.
the only thing on my maps now are tents and radars. And i no longer let other players in for assist. Im not picking up their garbage just so my fps maintains
there is also a video on reddit showcasing that placing a ridiculous # of ‘basic’ karakuri down in minato took fps down to 5 and eventually crashed the entire game