A method of improving replica server performance in a replica server system is described. The method comprises: transferring input data from a primary replica to a secondary replica upon receiving same; storing said input data on the primary replica; processing said input data in the primary replica after storing said input data, thus creating original output data; sending confirmation data from the secondary replica to the primary replica upon receiving said input data; and sending out said original output data from the primary replica upon receiving said confirmation data from said secondary replica. A replica server system for performing the method is also described.