When attacking the opponent's face (and they don't have any traps) the state of the board doesn't change (apart from the opponent's health total), taking regular pauses between face attacks makes it very obvious a bot is playing. Face attacks should happen in rapid succession, from the bot's calculation point of view multiple attacks to the face should be considered a single action with the resulting board state (opponent's final health total and all the attacking minions tapped) being calculated before the first minion attacks.

What AI are you using?
Silverfish needs to recalculate after every move, the default AI does not.

@JoyAdmin: IMHO there is a constant delay between each action. Would be great to have some randomness here (lower and upper bound).