Yes, all the network of the ISP gateway are forced at 100Mbps duplex full and they requires our side of the network forced too.
I tested with my forced LAN of the laptop at 100Mbps and connected directly to the gateway of the ISP, the speed is the optimal with 10Mbps/10Mbps down/up and international connectivity with 6Mbps/6Mbps the best rate. With cisco the cisco router 0,2 Mbps...