Are disabled objects rendered/calculated?

When you disable a (game)object, will it be calculated, rendered or placed in the memory?
And when you enable it, is this the same as instantiating the object??

Disables objects are in memory. Disabling and renabling is more efficient than an Instantiate/Destroy. They are not renderer. Most activity like Update(), OnGUI, and any coroutines in any component is suspended when a game object is disabled, but any InvokeRepeating() functions still continue to be called.