I'm constantly experiencing lag. It results in my ship or toon being moved back to where they where several seconds before. I'm on a 20mb connection and don't ever experience lag issues in my currently subscribed MMO's WoW or LotRO.
Sounds like lag issues. However, as you stated, it's likely not on your end. Some people have posted about changing graphics drivers for NVidia cards to a specific version helping with lag-like issues, but I'm not sure if that's the issue.
Unless someone else might have an idea, I think this is normal for a beta MMO. In fact, most MMOs I know of have all put out open betas usually for this as the main purpose - to stress test both the server setups and the networks.