"Spinning Wheels" and "connectivity issues" aren't necessarily the same thing.
How close the iOS device is to your computer does not determine the quaility of your WiFi connection. That is determined by how close the iOS device (and the commuter unless it is hardwired to the network) are to your Router's antenna. So theoretically, I could have my iPhone and Laptop literally touching each other and yet they could both be a half mile from my internet router's antenna and thus be totally inable to communicate. On the other hand, my laptop and iPhone might be in completely different rooms yet have excellent WiFi if they are both in sufficient range of the antenna.
So if you have connectivity issues when using WiFi, you need to look at the strength and quality of your WiFi signal. I routinely use WiFi to double check my FM GO designs for layout and other interface issues and have no trouble doing so.
"Spinning Wheel" delays in response could be due to a number of different issues and you'd need to describe your design and implementation in much more detail before others have much chance at suggesting possible solutions. (And these issues might very well be exactly the same no matter how good a connection to the host you have.)