Alright, ill bite.
How the Render (view distance) works:
As you can see items and objects de-renders as they move out of the selected view distance in the graphics settings.
Entering the casino:
Location of the casino:
Notice you you dont see the portal in the game world area or the icebergs around the tower area, or even the tower itself while you can see some of the stuff on top of it like the blackboard.
This is because we are way outside of the view distance of these objects.
Location of the game world area:
Entering and leaving the game world area:
As you can see you lag a little since it has to render objects in the plaza that was de-rendered due to the location of the game world area, and vice-versa.
Like i said before: it's proximity based, it renders stuff in whatever range you have set the view distance to be, if you could noclip to the casino the exact same thing would happen as when you press e on the door to the casino building, so again, you dont manually load the casino.
Also if you would be so kind as to explain this bit:
So, based on your previous statement, you don't want the stores to load when you walk up to them because it causes alot of lag on your end, but you want them to load when you walk up to them.
Im sorry but i really don't think im following you.