Here’s the breakdown of what it likely is and how to handle it:

In the base game, Bethesda bundles groups of static objects (like trash, buildings, and rubble) into single meshes called . This reduces the number of draw calls the engine has to make, which keeps performance high. However, if a mod alters even one small item inside a precombined cluster, the engine disables the entire cluster. This results in:

, one of the most critical performance and stability mods for Fallout 4. It acts as a resource master that allows other mods to interact with the game's visibility and pre-combination data without causing massive framerate drops or "flickering" geometry. Key Facts for Your Load Order

In short:

It contains various general world-space bug fixes necessary for the larger PRP mod to function correctly without losing vanilla data. Installation & Load Order