I got these and it connects 1 to the incoming BT router and the other in another room connected to one of the 1 to 4 network connections of another wireless router so have 2 wireless points going in different points of the house with 2 different SSID ( wireless point names).
If your wirless slows down then both computers used could use these from shy router to computer network connection on desktop.
they can cause slowdowns as people say even on the 40Mbs speed, what they are like on upto 80 and you get that who knows, mine is the chep BT broadband so upto 40 and get that as modem say could do 63 or so I think and upload at 23 so my 40 and 10 will be limited and could do more. These things work for me. If i speeded the internet connection up then not sure!.
there are more expensive 500Mbs versions I might have to have on the spped jump if I get one day on BT infinity or another FTTC supplier.
just a thought.
If sharing wirless between 2 things does it slow, I don't know as dont do with 1 laptop.