It turns out we don't have a fast enough connection to provide a good user experience while hosting the forums internally here at TE. I'll be moving the forums this evening to a new host.
This planned move should be much less intrusive than the last unplanned moved. I expect 1-2 hours of downtime and everything should transition smoothly.
I will be switching the forums to "read-only" at 5 PM and they should be up at their new home by 6:30 PM.