Were you using firewall software on your computer? If not then maybe you were letting in a bunch of traffic that the router's internal firewall has now put a stop to. Can't think of another reason why a router would speed things up really.
I just started messing around with this and have never used anything like it before. One question I have is that the Google Drive Folder that I have on my desktop is just kind of always there to be clicked on even if I am signed out on the computer.