HeartLess

Since I can't seem to post in the smp issue section, or I'm just an idiot I have to post this here. Ok. A few hours ago the server was fine, but then players reported a huge lag spike and then this started to happen... When you join the server you cannot move at all. You can't teleport to other players. The screen for players is very jerky and it is spazzing out. I don't think it is lag as I can chat with no delay. Anyone have any ideas? Because none of us do.