not sure what you mean?
ARD has 2 components - it has a client- called the vnc server which runs on the computer to watch - and a remote viewer application that in this case is called Apple remote desktop ( ARD )-
When ARD is not running on the remote computer - it doesnt do anything on the computer being watched- it has no impact on performance-
Performance is only impacted when the computer is being observed - if you arent observing the screens nothing bad happens-