[Maan76]

comparison of 21680 and 21679 in different speed parameters (including graphics) .

21679
Integer;480.1321;Moves/25 usec
Floating point;11.216;MWIPS
RAM access;664;Speed index
Draw bitmaps;1109;Speed index
Main storage (write);2494.52;KB/sec
Main storage (read);7202.81;KB/sec
Storage Card (write);4781.32;KB/sec
Storage Card (read);5885.06;KB/sec
File List;2927;Items/s
FL: Storage Card;3427;Items/s
loading;3852;ms

21680

Integer;466.6308;Moves/25 usec
Floating point;10.885;MWIPS
RAM access;671;Speed index
Draw bitmaps;1113;Speed index
Main storage (write);2641.44;KB/sec
Main storage (read);6508.47;KB/sec
Storage Card (write);4504.40;KB/sec
Storage Card (read);6934.54;KB/sec
File List;1816;Items/s
FL: Storage Card;3153;Items/sec
loading;4394;ms

note : test conducted on a pp of 16 which gave me the highest results for both ROMs .

conclusion :both ROM versions are fast but 21679 is a little bit faster ,which obviously is (I noticed that even before running the benchmark test).
I am going to stay with it until NRGZ releases something beat it .