Loading scene

A lot of old games used to have loading screens. Even now adays there are still loading screens. How does this work in Unity?

If a scene is big in file size, like 30mb and has so many models and textures and uses a lot of resources, that scene may take a while to load? So far I have never come across waiting times for my scenes to load.

So some people make load scenes/ scenes that are very small and usually have a loading graphic . These scenes are visible while the big scenes are trying to load.

Is this how it works? I dont think I will use a load screen for my project becuase it loads very fast.

Actually i think loading scene is itself an empty scene and while loading other things like what you said, textures,sounds,models/cinematics. the scene will just run until loading is complete and jumps to that scene.