What would be nice is a direct connection between the iPad and computer instead of wifi. My work network is a hassle to log into so I don't event do it most of the time. If I need to look up something on the iPad, i pull out my cell phone hotspot.
If a large change occurs on your Mac screen and we are unable to keep up, we show pixelated content. This is a signal that we don't have the full screen in yet, and that the screen image is loading. Astropad is honest, when the image is clear, you are assured what you see is the actual content, artifact free.
Sending high image quality over WiFi is really challenging. Ever wonder why we don't have wireless TVs? or Wireless computer displays? It's really really hard to do.
I'm not sure what sense you mean "don't have" or "wireless". So first of all, props to ghostly_s, because in the '30's when serious TV experimentation started a lot of the tests were radio-wave based.