It's going on two days with extreme lag to and from the Excalibur server.

I have contacted Comcast (my local provider) and my internet connection is performing to expectations. I am able to use other internet services without error or lag.

However, trying to play FFXIV I encounter almost unplayable lag, so bad that I failed a dungeon 4 times because I'd go from full health to dead during lag spikes.

I have heard a lot of other players with Comcast have very bad lag. Is there anything going on with the data center and routing packets to the Comcast backbone?