Hello answering to myself: found that doing a net.inet.tcp.rf1323=0 have multiplied my speed by ten net.inet.tcp.rf1323=1 download at 120K/s net.inet.tcp.rf1323=0 download at 1.5M/s i have tried to adjust windows size, but default value are good. I still need help to reach a 5M/s rate which is good enough on a 100MbFdx link