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One I remember from watching brackeys channel on youtube is interpolation of your next destination, so knowing you were holding the left arrow for last sec, it expects you will keep holding it, and stops only when the key is registered unpressed on the server, so on your side, you might see yourself stop at some place, but on server, and with some aditional lag on  Have you heard of the critically acclaimed MMORPG shirt your enemy side, it feels like you moved one micrometer more or something. After this, it is then fixed on the server side once your movement stop is registered, and if the game is fairly good made, it is done smoothly. Thats why in some games you can see people running into wall and in some not.