How much strain will around 30-40 worlds cause to the server, and if there is any way of reducing that strain like no having chunks loaded if not asked by a player.
StyL_TwisT Im developing a plugin that uses multiple worlds, i want to know how much strain it will cause o.o
Well all those spawn areas stay loaded, so yes, it will cause strain. How much, I'm not sure, but probably equal to having 15 extra players on (at least)
Yes, doing checks every few seconds to compare the player locations. If the two players are in the same world, and the distance is greater than a number, hide the players from each other (and optionally don't hide the players from mods/admins/etc).