A shell renders every prop in the interior all the time. A real MLO lets the engine cull what you cannot see. Here is what that costs you in FPS.
Smeared textures, invisible arms and outfits that swap on restart all trace back to how GTA numbers clothing. Here is the system, and the fix order.
DUI puts a live Chromium page on any texture in the world, from phone screens to nightclub TVs. Powerful, and expensive if you do not manage it.