Dunno what it does, however cachebusting from my circles is how long/much something can load into a reuseable cache before dumping it and reloading data. So you would want a higher cachebusting value. The useRenderingBackground sounds like a boolean, a 1 or 0, for on or off. If you set that to 0, I bet some stuff would look BAD. Like texture popin, missing textures, etc.
