In case anyone ever comes across this, Ethernet speed in Princeton Graduate College is 100 Mbps (by the end of the 2016–2017 academic year). Well, in NGC at least; I did not survey OGC residents, but I highly suspect the result would be the same. According to https://www.net.princeton.edu/oit-ethernet-service/ Ethernet speed in dorms and apartments should either be 100 Mbps or 1 Gbps; apparently (N)GC residents are an unfortunate bunch. I’ll be moving to Lawrence Apartments in August; I hope I’ll have gigabit Ethernet there, but I’m not optimistic about that. Too bad I didn’t manage to draw into Lakeside, which is new and promises gigabit on their website.
Oh, and I should mention that Wi-Fi in NGC (either eduroam or puwireless which I heard is being phased out) is absolute crap. Hangs and drops all the time. Sometimes I can’t even load a YouTube video over dorm Wi-Fi. One star. If you’re serious about your Internet connection, bring your own router and switch. The Ethernet, albeit not so fast, is at least fairly reliable. (IIRC even the Ethernet service blacked out once for a couple of hours on a weekend afternoon.)