Ok, so say if my note 2 were being tethered as a wifi device for my macbook.
Apple TV offers mirroring through the wifi network to send audio and/or video to my tv and/or home theater.

I watch whatever video on my macbook and send the audio and or/video via the apple tv and airplay to be outputted to my home theater/tv. Does this slow down the WIFI?
If it does, this would then assumingly decrease my video streaming quality and also the quality of the airplay quality mirroring as well. But I've read two things, that it does do this, but also read that apple now doesn't use wifi for airplay, which wouldn't decrease my streaming quality due to lessened WIFI, right?

Any experience here?