I have a dlink dir855 router which i believe runs at 1gb on the lan side. i have connected one of its inputs to a zxyel 1gb 8 port switch as I have more than 4 devices to plug into the router. i have then plugged into the switch a gigabyte 1gb 5 port switch in another room and run a lead from there to a computer with 1gb network card in another room. will having a switch plugged into another switch reduce the network speed? i ask as previously i ran a cable from my main pc to my router and my upload speeds to my nas were much faster, now i am only getting a 9MB upload speed yet all the devices should attach at 1gb speed.