How about a curtain feature for people who can't handle it. Each room is concealed by a 'curtain' unless you enter it, effectively eliminating the processing power needed. This would have to make people load the room again before entering it, but that's what we do already, and it's not slow at all.

For the people saying that it's laggy:

Not everyone has to use this. I think that it would be a completely separate thing, not forced upon everyone.