

If it changes the air pressure, changing the refractive index, it will affect how fast the waves will travel. If you put it behind the router blowing towards the computer, does that increase the pressure? Then it would slow down I think. But this would only make a difference for a single wave packet; any real connection sends many packets and would be limited by the frequency of packets sent.
I am pretty confident it’s the smartphone OSs (Android and iOS) that are more at fault. I remember having to install a file browser on my smartphone. Kids grown up with smartphones may not even know there are files and folder structures.