There are recurring, severe lag spikes in the latest experimental build. I was playing on the US server, had no company and it occured in various situations so I could not see a pattern to the cause. The game froze entirely for 1-3 seconds during these episodes. It very much resembled the kind of lag spike you can get when approaching the vicinity of too large bases on modded servers.
I have not seen this kind of lag spike in the vanilla game for a long time. It does not happen on stable and did not happen in the latest exp build or the Livonia beta.