Thanks for the quick reply 0-0
And yes the pc does lag when you play through it, my specs are
Cpu: intel pentium silver N5000
Ram: 12 GB
Graphics: UHD Graphics 605
and if you wish to know my storage space: 128 GB
Additionally I could suggest you make it not render until your in the area of the room, so everywhere you can see on the screen is rendered however anything off-screen is not rendered until it appears on screen.
Yes this could be quite difficult however it is definitely possible depending on what code language you are using :)
I can send a video of it if you wish