Modified radix sort system

System, methods, and computer-readable media. A method performed by a mail sorter includes receiving a plurality of mailpieces in an input of the sorter. The method includes performing a buffered sort process by transporting the mailpieces along a plurality of transport lanes, each transport lane having an output tray and a buffer, from the input to respective buffers and output trays on the transport lanes, but not transporting mailpieces from the input to an output tray on a selected transport lane. The method includes transporting mailpieces from the buffer to the output tray on the selected transport lane during the buffered sort process. The method includes selecting a new selected transport lane of the plurality of transport lanes. The method includes repeating the buffered sort process and the transporting mailpieces from the buffer to the output tray on the selected transport lane.