Unable to join friend's world

I am trying to join my friends world but every time i try to join it takes very long and the world is very laggy for me and only me but if i join other worlds and servers they are completely fine and i don't lag at all and it started happening as soon as he got his ps5 and i tried to join it would be stuck on locating server and the world would be laggy.
Playstation 4 and Iphone 11