I'm french, and I lag almost all the time. I still 2 bar instead of 3, it is not unplayable, hitting the door well. But for those who are blocking with the shield is not accurate. I blocked the shot but before I took the shot anyway and I'm sure it's because of this lag.
Only on this game I lag, I have a excellent internet connection. So is it me, or is it that's all the French who can lag on a game due to a U.S. hosting?
It may be due to the US only hosting. As far as anyone knows the servers are in the west coast US somewhere.
Tough at the same time, make sure that nothing else is using your network connection while playing Spiral Knights. This game performs very poorly on a congested local network.