Massive lag spikes?

While in a boss fight, and this is where you areally will be unpleasantly surprised... the game started to throw massive lagspikes my way (guessing it's lagspikes because the game goes into "paused" state). Checked the connection I was at a stable 1000 Mbps down and 100 Mbps up.
Hopefully this is due to the beta, but the fight was impossible to play.