hi, without the router I can reach the advertised speeds of 100MBits down and 20 Mbits up.
if I use the router speed tests GREATELY vary
I can get anywhere form about 75Mbits all the way down to 12Mbits down.
downloading stuff when connected directly to the modem is extremely fast, about 1GB per minute.
downloading thru the cisco my speeds come down from 12MBps to about 3-6MBps
there is no QoS enabled on the router. and wan connects to a gigabit interface.