I'm having issues as well, during peaktimes in evenings, typically between the hours of 7pm and 10:30pm EST. I am in Washington D.C. metro area (Northern Virginia) and using Verizon FIOS. I have absolutely no problem doing anything else during those hours, so I'm guessing the problem lies in the connection to this game specifically. No problems with any other MMOs, including WoW, Tera, GW2, etc.

Like others have reported, I'm getting lag spikes every 5-10 seconds, for about 1 second at a time. Its made raiding impossible for me (I basically got carried through titan) and frustrating as well. I'm really, really hoping this is resolved by heavensward.