Synaesthesia Honours Project: Teleport vs Small Map

After making a test where I did two builds: one where level maps are minimized to only crucial rooms and other one when player teleport to different location and other maps are removed lead to one conclusion: latter option is more efficient because there’s no loading time between levels and also build size is much smaller:

1. Smaller room: 2.72GB

2. Teleport: 1.69GB

At this point I’m confused, and I don’t understand how UE4 works but it looks like it multiple all the assets for each map instead of using references. This is probably lame explanation but it’s first what came to my mind. So, the plan is to utilize teleport functionality and simply resize level by adding more rooms.