This app-nap functionality is available in OS X too so long as the app implements the correct APIs, which many do. This was introduced in 10.8 as part of their performance effort I believe.
This is seen in OS X when an app window appears greyed out with a progress spinner in the center. The app may start out in this state if the machine was hibernated, or it may go into this state if it is open but it fits certain criteria, like all its windows being occluded by others. When this happens, the process is killed.
This is seen in OS X when an app window appears greyed out with a progress spinner in the center. The app may start out in this state if the machine was hibernated, or it may go into this state if it is open but it fits certain criteria, like all its windows being occluded by others. When this happens, the process is killed.