Is the remote desktop client in windows really bandwidth intensive? We get roughly 16mb/s down and 1mb/s up even at fairly peak times, however as soon as dad goes on his laptop to use his desktop computer back at the office the internet becomes horribly slow, it doesn't seem to be a speed issue more just like the connection has tonnes of latency? I presume the desktop connection is eating through most of the availible bandwidth which is why the speed is still ok but its still laggy? Would upgrading to fibre optic broadband maybe help? (My dads ISP contract is up in a couple of months) Or any settings on the router or desktop connection client that would help?