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olimex esp32 ethernet is super fast

 3,509,720 b/s
 3,509,914 b/s
 3,510,135 b/s
 3,510,324 b/s
 3,510,501 b/s
 3,510,691 b/s
 3,510,849 b/s
 3,511,031 b/s

#define ETH_CLK_MODE ETH_CLOCK_GPIO17_OUT
#define ETH_PHY_POWER 12

#include <ETH.h>
ETH.begin();