Now the next problem. I'm getting modem speeds via Ethernet. Any ideas?

If you were on a PC, I'd say to check that you didn't adjust things like the MaxMTU and the TCP packet size in an attempt to optimize online gaming. But you said you were on a Mac, so I don't know how those things are handled. Re-post that question as its own thread under "Off Topic" and I'm sure some of the Mac experts on the BBS will help you out.