General Practices Question

Hi, I am new to Unreal/Development in general and I am making some good progress so far. I had a quick question regarding performance.

I have a sort of museum with a couple of display models in each museum room. I was wondering performance-wise if I am better
to have a seperate map for each room of the museum where the player ‘transports’ between each room, using the [open level] command,

or whether if it made no difference performance/fps wise I could build all the rooms within one map to prevent me having loading pauses and just teleport the player betwen coordinates on the same map.

I have to keep the fps as high as possible due to it being a VR/stereoscopic experience so every little bit counts. I guess I am asking whether models in the same map, but not actually seen by the camera have any effect on the framerate in general.