Depending how your going to access your data you donot have to refill the array on each tick just like you dont have to recalculate indicators. see



bool ArraySetAsSeries(double&array[], bool set)Sets indexing direction of the array. If the set parameter has the TRUE value, the array will be indexed in a reversed order, i.e., the last element has a zero index. The FALSE value sets a standard indexing order. The function returns the previous status.