Hi, some of you had made experiment of eth shield speed?
the Wiznet W5100 support the 100mbps but i don't think the arduino can ... the Wiznet W5100 stransfer data to arduino via SPI so i supporse that the max speed of SPI is the real data transfer speed using eht shiled more the lib\software overhead.
Should be grat if you made test both using UPD and TCP because for it's nature UDP should be faster than TCP, for trasnfer i mean arduino is a client (receiver) and a PC act as host (server)
Thanks