I can't say for sure, but I really don't think they're on the same hardware. If I recall my HnH history correctly, Seatribe ran the HnH game and web server on the same hardware for a little while, but the game grew enough where it just wasn't possible (forum software itself, if the forum is busy enough, can tax modern processors). I was honestly surprised to find out HnH ran on just one system with as many people as I've seen it support. Most MMOs usually have one physical server per zone and only support a limited number of people per area.
Here's something simple: if the lag is consistent for everyone, it's the server. If it's only an issue for you, it's your computer. If it's an issue for many, but not all it's in the middle, and the kicker on this is... no matter how far apart in the world you are, two people can end up routed through the same servers while two other people in the same areas can be routed through a completely different route. It's the nature of the internet.
This issue would be a little more reasonable if this weren't a beta, but as it is, some lag is to be expected. Lag that isn't universal, however, isn't something the devs can do anything about unless there's a bug in the client code. The best we can do on the forums is help you track it down or fix your end if that's the problem.