Simple Overlay Camera takes 0.4ms

I just have a very simple Overlay camera with camera stacking and its only layer is what the player is holding in his hand and even if it render nothing because no GameObject that belongs to that layer exists it still takes 0.4ms. Why is this such a huge hit for Performence is this normal and can I change this?

Multiple rendered cameras are normally the single largest performance drain you can have in a game. For every camera rendering to the screen the engine has to render your game an extra time, so it’s almost as if you are running all you graphics twice.