Indeed a strange thing. 
I never saw something like that in 25 years of using windows. It's not like it's draining CPU power, it just seems to mess up Lightroom.
I can even start and deactivate AirVideo while having Lightroom open and I see the change. Meaning, I don't have to close and re-open Lightroom to see the performance change.
Anyway, this should be looked into by Adobe and the AirVideo guys (I informed them about the problem). This kind of stuff shouldn't happen.
I hope a few people out there have a better running Lightroom now, 'cause for me it sure wasn't a nice experience up to now...at all...
Cheers
Alex