If I am in a clan I have lags. As soon as I leave the clan my game runs smoothly. There are no connection problems, but rather the hanging of the game. The problem has existed since the update 2.6. I hope you find the error soon.
Hi Shade! Thanks for reporting this - after the investigation we have found out that right now with the new feature that puts your clan members on the top of the friendlist, long friendlists can cause lags. We will have a fix for this in the next update, but we recommend all the players with the long friendlist, to remove unnecessary friends.