You will have to be careful with the way you build your levels, to chose code over blueprints,
I work with BIGDATA and Optimization so performance is EVERYTHING to me However if you do not work with Optimization in a technical level like I do than you have to be careful with how you build your game other cheats you can use is Dynamic lighting so you wont have to bake anything on the level because that alone is a nightmare.
You know try to be smart with how you build the level and work with the terrain don’t be like the others who thing they can do everything simply because they depend too much on Big Memory.