Disabled/invisible Object and Optimization

Hello everyone,

I would like to make a simple question that it scratches the back of my head.

If an object inside the Scene is disabled/invisible and will never be used during game (ex. an old model lets say which you ve decided not to use, but Level Designer is not bother to remove it)

After you build the game, does it actually takes space (MB) inside the game? Will it make the game bigger in size? Will it have any affect on the performance? (I know it wont render it, so its a more of a load-delay question)

Thank you in advance