From ESOUI Wiki
This function controls whether the game world is visible. If the game world is hidden, then the screen will be solid black in its place.
If you're rendering a full-screen UI with no transparency, then perhaps it might be more efficient to disable rendering of the game world. Just make sure to turn it back on when your UI is closed!
- Whether to render (true) or hide (false) the game world.
d("You can defeat Molag Bal, eh? But can you do it blindfolded?!") SetShouldRenderWorld(false) d("Hahahahaha!")