I feel you. I have recently started playing online, since single play is busted. Can’t stand official pve servers because of the problem you have just described. People are building these massive useless structures (not all of them) that lag you out to a point of game crash (on ps5). How ever pvec is even funnier. Players are waiting by the castle for you to crash and nick/kill thralls you dragging or kill and loot you during pvp hours.
Unfortunately, there is nothing you can do about it. Recently, Kiah on fire (streamer) rised some issues about people building on top of world bosses and chest and FunCom replied: “no violation”. Its just the state of the game. I am just worried the game will be totally abandoned after release of Dune.