Wifi connections can produce very acceptable results, but performance issues may arise when many devices are connected. The radio in a wifi router can only listen to one device at a time, forcing other devices to wait and retry repeatedly. This problem worsens as more transmitters are added. Even interference from sources around of course can hamper performance.
The portion of the radio spectrum you are using may be serving numerous wireless networks in the same vicinity. A dedicated network helps minimize problems, as does careful channel selection – but a wired connection is always preferable in mission-critical settings.
In some cases a wireless connection may be acceptable to your workflow, but NewTek Support does not recommend or support this and would suggest sticking with wired networking instead for the sake of reliability.