In my experience, 1Gb connections are more sensitive to connection issues than 100Mb connections. So while yo might get close to 70% capacity on a 100GB connection (70Kb), you will not likely get anywhere near 700Kb on a 1GB connection. In some circumstances, you might not even get 180Kb (3x60Kb.) (I've seen 1GB connection as slow as 20Kb under some conditions.) The PC could also be a bottleneck if the CPU cannot keep up or there is a hardware or software issue. Task manager can provide an overview of connection speeds but a more detailed analysis is required if there are serious problems. OTOH, if everything is working Ok, there shouldn't be an issue with this setup.