It is a boolean property which defines whether each item of series is calculated independently on previous item or not. By default, it is set to false, which means that N item of any series in unit can be calculated only after N-1 item. Before setting the parameter to true developer should make sure that the logic of the unit allows to use values without calculating previous values. Many indicators cannot use discontinuous calculation because each their next value depends on previous value. For example, any moving average calculation needs continuous calculation. Consider that the calculation unit has Result series, and someone outside retrieves Result[1000] item. When IsDiscontinuousCalculation is false, all items before 1000 must be calculated, but with true value the state of previous items does not make any sense. So, item 999 will be calculated only when someone will try to get its value