Originally posted by Gisbert:

Best advice I got for you is to google "valheim server lag" and you find not a fix but a small tweak that helps most. It will not remove the problem, just reduce it a bit. Thank me later.

Will thank you for pointing in the general direction, but if you mean the DLL tweak for data rate, it seems that parameter is no longer there in this version of the game. I downloaded the dnSpy thingy and did as told, but it ain't there.