chess.com steal my time about 10 seconds/move.
I think that is for poor conection.
https://support.chess.com/customer/en/portal/articles/1444918-my-internet-connection-is-fine---why-am-i-getting-disconnects-
https://www.chess.com/blog/News/how-to-adjust-your-live-chess-connection
Those articles have suggestions to help with disconnects and lag. Your location and distance from the Live servers also play a part, but there isn't much you can do about that.