The maximum deviation is the value in points that represents the allowed price deviation. Activating the function of maximum deviation from the quoted price in the trading platform means that the trader automatically agrees to a new price when opening an order if it differs from the current price by less than the specified number of points. This function is used in the instant execution mode and is useful in a turbulent market when the prices are highly volatile.
During strong market movements or server overload, it can be difficult to place an order. To save yourself some time, you can use the “Enable maximum deviation from quoted price” function. Otherwise, if the price changes quickly at the time of placing the order, the server will set a requote, and the trader will be offered to open a trade at the new price available at the moment. And this can take some time and may deprive you of the opportunity to enter the market at the right time.