cient secondary (S) frame rate by finding and minimizing for a plurality of secondary frame rates a sum of at least (1) ((P/S)+r)F1 where F1 represents a number of calls of a primary frame of frame rate P to a secondary frame of frame rate S and r is a variable chosen based on a method of storing framing information; and (2) ((S/T)+r)F2 where F2 represents a number of calls of said secondary frame