Lag seems to be fixed by last server maintainance (that also fixed team games match making). Now the lag seems back. Yesterday i played some games and some of them where pretty laggy.
In one game i talked about it with opponent. We were both from mainland Europa and we played on UK server. I checked other games and those were also played on UK server.
What i really dont understand is why i play mainly on UK server (OK, UK isnt that far), but second most just server in USA. I almost never played on EU server.