After time, game seems to build lag.

[nivomi]

My friends and myself played a long (2h21m) game earlier, and near the end, both client players seemed to have a delay, in one player's case up to 5 minutes, in movements of cards and pieces, rendering the game unplayable. The server was unaffected by this, and could see all client's movements instantly. The client players, however, could not see their movements until their game "caught up" to the point where they submitted their movements. Resetting the board did not remove this issue.

[EhsanKia]

I've noticed too. It became highly unplayable. Reconnecting helped a little bit but it quickly got out of hand again.