Hide objects

[komyali]

I have really big scene of interior. I dont want to render all lights, objects and overload memory, so I create group of rooms and hide them, also uncheck Hidden lights in Global switches, so I dont render them. My question is does this help like I delete objects from the scene, or I need to do something else. Also statistic is the same like 1 500 000 polygons when I hide rooms or unhide it doesnt move