Good question. I don't know the details but the Valheim Network Optimizer mod is still updating and says "Increases the data transfer cap (Yes this works post patch 0.148.6) ... If your playing with 2-3 people casually this probably wont help that much because the new vanilla network fixes they released are actually not bad. If you are playing with more than that or building very large bases you may want to consider giving this mod a try."

https://www.nexusmods.com/valheim/mods/537