Although this could just be due to poor Wi-Fi connectivity, you should confirm that it is not due to the I/O Monitor Ethernet link running at 10 Mbps instead of the expected 100 Mbps. The easiest way to verify this is to look at the LED indicators on the Ethernet port of the I/O Monitor. You should see the amber LED illuminated indicating 100 Mbps operation. If only the green indicator is lit, the port is running at 10 Mbps.
It is possible to end up with 10 Mbps operation if the I/O Monitor is plugged into an old router, Ethernet hub or connectivity extension device of some kind. However, other than a few rare instances, almost all modern routers and Ethernet switches will reliably support 100 Mbps or higher (1 Gbps).