Agharta wrote:Ideally you want to be running 5GHz 802.11AC provided both your router and WiFi Adapter support it.
You'd need to give the make and model of both of those so it can be checked.
Both machines are using the same Wifi so it is unlikely to be a generic Wifi issue - it will be something peculiar to the i3 machine.
The only thing that I would check is that the speed test that you performed on the old machine was for a reasonably sustained time as it is possible that a short test could give an overly optimistic result. Better still - does your router allow you to plug in a USB disk? Can you check the data rate streaming a very large file from this disk?