Oh, so you were talking about the performance impact on the PC side of having to stream the game. That exists, but it just means you need a strong PC.
I've also found (along with many others... in fact I'd say this is the standard wisdom from the many forums where I've read about different setups) that Virtual Desktop gives you much better performance than either the real link cable or Airlink, if your PC is struggling. The way it encodes has significantly less overhead. My PC was struggling with Alyx on both Airlink and the cable, but it was a night-and-day improvement to use Virtual Desktop instead.
Not really true, as I recall. Using the cable still means encoding the video to a different format, and that encoding has a major impact on your PC. Which is again why almost no one who has a PC which is struggling a bit with VR would ever use the cable. I can confirm along with others that your PC takes a major hit to do all that encoding fast enough while the game is running.